Cipro I.V.

Patient Information about Cipro I.V.

CIPRO®
(Sip-row)
(ciprofloxacin hydrochloride) Tablets for Oral Use

CIPRO®
(Sip-row)
(ciprofloxacin hydrochloride) for Oral Suspension

CIPRO®XR
(Sip-row)
(ciprofloxacin hydrochloride) Tablets for Oral Use

CIPRO®IV
(Sip-row)
(ciprofloxacin) Injection for Intravenous Infusion

Read this Medication Guide before you start taking CIPRO and each time you get a refill. There may be new information. This information does not take the place of talking to your healthcare provider about your medical condition or your treatment.

What is the most important information I should know about CIPRO?

CIPRO, a fluoroquinolone antibacterial medicine, can cause serious side effects. Some of these serious side effects could result in death.

If you get any of the following serious side effects while you take CIPRO, get medical help right away. Talk with your healthcare provider about whether you should continue to take CIPRO.

1. Tendon rupture or swelling of the tendon (tendinitis).

• Tendon problems can happen in people of all ages who take CIPRO. Tendons are tough cords of tissue that connect muscles to bones. Symptoms of tendon problems may include:
  • pain
  • swelling
  • tears and inflammation of tendons including the back of the ankle (Achilles), shoulder, hand, or other tendon sites.
• The risk of getting tendon problems while you take CIPRO is higher if you:
  • are over 60 years of age
  • are taking steroids (corticosteroids)
  • have had a kidney, heart or lung transplant
• Tendon problems can happen in people who do not have the above risk factors when they take CIPRO.
• Other reasons that can increase your risk of tendon problems can include:
  • physical activity or exercise
  • kidney failure
  • tendon problems in the past, such as in people with rheumatoid arthritis (RA)
• Call your healthcare provider right away at the first sign of tendon pain, swelling or inflammation. Stop taking CIPRO until tendinitis or tendon rupture has been ruled out by your healthcare provider. Avoid exercise and using the affected area.
  The most common area of pain and swelling is the Achilles tendon at the back of your ankle. This can also happen with other tendons. Talk to your healthcare provider about the risk of tendon rupture with continued use of CIPRO. You may need a different antibiotic that is not a fluoroquinolone to treat your infection.
• Tendon rupture can happen while you are taking or after you have finished taking CIPRO. Tendon ruptures have happened up to several months after people have finished taking their fluoroquinolone.
• Get medical help right away if you get any of the following signs or symptoms of a tendon rupture:
  • hear or feel a snap or pop in a tendon area
  • bruising right after an injury in a tendon area
  • unable to move the affected area or bear weight

2. Worsening of myasthenia gravis (a problem that causes muscle weakness). Fluoroquinolones like CIPRO may cause worsening of myasthenia gravis symptoms, including muscle weakness and breathing problems. Call your healthcare provider right away if you have any worsening muscle weakness or breathing problems.

See “What are the possible side effects of CIPRO?”

What is CIPRO?

CIPRO is a fluoroquinolone antibacterial medicine used in adults age 18 years and older to treat certain infections caused by certain germs called bacteria. These bacterial infections include:

• • urinary tract infection
  • chronic prostate infection
  • lower respiratory tract infection
  • sinus infection
  • skin infection
  • bone and joint infection
  • nosocomial pneumonia
  • intra-abdominal infection, complicated
  • infectious diarrhea
  • typhoid (enteric) fever
  • cervical and urethral gonorrhea, uncomplicated
  • people with a low white blood cell count and a fever
  • inhalational anthrax
  • plague
• Studies of CIPRO for use in the treatment of plague and anthrax were done in animals only, because plague and anthrax could not be studied in people.
• CIPRO is also used in children younger than 18 years of age to treat complicated urinary tract and kidney infections or who may have breathed in anthrax germs, have plague or have been exposed to plague germs.
• Children younger than 18 years of age have a higher chance of getting bone, joint, or tendon (musculoskeletal) problems such as pain or swelling while taking CIPRO. CIPRO should not be used as the first choice of antibacterial medicine in children under 18 years of age.
• CIPRO XR is only used in adults 18 years of age and older to treat urinary tract infections (complicated and uncomplicated), including kidney infections (pyelonephritis).
• It is not known if CIPRO XR is safe and effective in children under 18 years of age.

Who should not take CIPRO?

Do not take CIPRO if you:

• Have ever had a severe allergic reaction to an antibacterial medicine known as a fluoroquinolone, or are allergic to ciprofloxacin hydrochloride or any of the ingredients in CIPRO. See the end of this Medication Guide for a complete list of ingredients in CIPRO.
• Also take a medicine called tizanidine (Zanaflex®).

Ask your healthcare provider if you are not sure.

What should I tell my healthcare provider before taking CIPRO?

Before you take CIPRO, tell your healthcare provider if you:

• have tendon problems
• have a disease that causes muscle weakness (myasthenia gravis)
• have liver problems
• have central nervous system problems (such as epilepsy)
• have nerve problems
• have or anyone in your family has an irregular heartbeat, especially a condition called “QT prolongation”
• have or have had seizures
• have kidney problems. You may need a lower dose of CIPRO if your kidneys do not work well.
• have joint problems including rheumatoid arthritis (RA)
• have trouble swallowing pills
• have any other medical conditions
• are pregnant or plan to become pregnant. It is not known if CIPRO will harm your unborn baby.
• are breastfeeding or plan to breastfeed. CIPRO passes into breast milk. You and your healthcare provider should decide whether you will take CIPRO or breastfeed. You should not do both.

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

CIPRO and other medicines can affect each other causing side effects.

Especially tell your healthcare provider if you take:

• a steroid medicine
• an anti-psychotic medicine
• a tricyclic antidepressant
• a water pill (diuretic)
• theophylline (such as Theo-24®, Elixophyllin®, Theochron®, Uniphyl®, Theolair®)
• a medicine to control your heart rate or rhythm (antiarrhythmics)
• an oral anti-diabetes medicine
• phenytoin (Fosphenytoin Sodium®, Cerebyx®, Dilantin-125®, Dilantin®, Extended Phenytoin Sodium®, Prompt Phenytoin Sodium®, Phenytek®)
• cyclosporine (Gengraf®, Neoral®, Sandimmune®, Sangcya®).
• a blood thinner (such as warfarin, Coumadin®, Jantoven®)
• methotrexate (Trexall®)
• ropinirole (Requip®)
• clozapine (Clozaril®, Fazaclo®ODT®)
• a Non-Steroidal Anti-Inflammatory Drug (NSAID). Many common medicines for pain relief are NSAIDs. Taking an NSAID while you take CIPRO or other fluoroquinolones may increase your risk of central nervous system effects and seizures.
• sildenafil (Viagra®, Revatio®)
• duloxetine
• products that contain caffeine
• probenecid (Probalan®, Col-probenecid ®)
• certain medicines may keep CIPRO Tablets, CIPRO Oral Suspension from working correctly. Take CIPRO Tablets and Oral Suspension either 2 hours before or 6 hours after taking these medicines, vitamins, or supplements:
• an antacid, multivitamin, or other medicine or supplements that has magnesium, calcium, aluminum, iron, or zinc
• sucralfate (Carafate®)
• didanosine (Videx®, Videx EC®)

Ask your healthcare provider for a list of these medicines if you are not sure.

Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine.

How should I take CIPRO?

• Take CIPRO exactly as your healthcare provider tells you to take it.
• Your healthcare provider will tell you how much CIPRO to take and when to take it.
• Take CIPRO Tablets in the morning and evening at about the same time each day. Swallow the tablet whole. Do not split, crush or chew the tablet. Tell your healthcare provider if you cannot swallow the tablet whole.
• Take CIPRO Oral Suspension in the morning and evening at about the same time each day. Shake the CIPRO Oral Suspension bottle well each time before use for about 15 seconds to make sure the suspension is mixed well. Close the bottle completely after use.
• Take CIPRO XR one time each day at about the same time each day. Swallow the tablet whole. Do not split, crush or chew the tablet. Tell your healthcare provider if you cannot swallow the tablet whole.
• CIPRO IV is given to you by intravenous (IV) infusion into your vein, slowly, over 60 minutes, as prescribed by your healthcare provider.
• CIPRO can be taken with or without food.
• CIPRO should not be taken with dairy products (like milk or yogurt) or calcium-fortified juices alone, but may be taken with a meal that contains these products.
• Drink plenty of fluids while taking CIPRO.
• Do not skip any doses of CIPRO, or stop taking it, even if you begin to feel better, until you finish your prescribed treatment unless:
  • you have tendon problems. See “What is the most important information I should know about CIPRO?”
  • you have a serious allergic reaction. See “What are the possible side effects of CIPRO?”
  • your healthcare provider tells you to stop taking CIPRO
    Taking all of your CIPRO doses will help make sure that all of the bacteria are killed. Taking all of your CIPRO doses will help lower the chance that the bacteria will become resistant to CIPRO. If you become resistant to CIPRO, CIPRO and other antibacterial medicines may not work for you in the future.
• If you take too much CIPRO, call your healthcare provider or get medical help right away.

What should I avoid while taking CIPRO?

• CIPRO can make you feel dizzy and lightheaded. Do not drive, operate machinery, or do other activities that require mental alertness or coordination until you know how CIPRO affects you.
• Avoid sunlamps, tanning beds, and try to limit your time in the sun. CIPRO can make your skin sensitive to the sun (photosensitivity) and the light from sunlamps and tanning beds. You could get a severe sunburn, blisters or swelling of your skin. If you get any of these symptoms while you take CIPRO, call your healthcare provider right away. You should use a sunscreen and wear a hat and clothes that cover your skin if you have to be in sunlight.

What are the possible side effects of CIPRO?

CIPRO may cause serious side effects, including:

• • See, “What is the most important information I should know about CIPRO?”
  • Serious allergic reactions. Serious allergic reactions, including death, can happen in people taking fluoroquinolones, including CIPRO, even after only 1 dose. Stop taking CIPRO and get emergency medical help right away if you get any of the following symptoms of a severe allergic reaction:
    • hives
    • trouble breathing or swallowing
    • swelling of the lips, tongue, face
    • throat tightness, hoarseness
    • rapid heartbeat
    • faint
    • skin rash
      Skin rash may happen in people taking CIPRO even after only 1 dose. Stop taking CIPRO at the first sign of a skin rash and call your healthcare provider. Skin rash may be a sign of a more serious reaction to CIPRO.

• Liver damage (hepatotoxicity). Hepatotoxicity can happen in people who take CIPRO. Call your healthcare provider right away if you have unexplained symptoms such as:
  • nausea or vomiting
  • unusual tiredness
  • stomach pain
  • loss of appetite
  • fever
  • light colored bowel movements
  • weakness
  • dark colored urine
  • abdominal pain or tenderness
  • yellowing of your skin or the whites of your eyes
  • itching
    Stop taking CIPRO and tell your healthcare provider right away if you have yellowing of your skin or white part of your eyes, or if you have dark urine. These can be signs of a serious reaction to CIPRO (a liver problem).
• Central Nervous System (CNS) effects. Seizures have been reported in people who take fluoroquinolone antibacterial medicines, including CIPRO. Tell your healthcare provider if you have a history of seizures. Ask your healthcare provider whether taking CIPRO will change your risk of having a seizure.
  CNS side effects may happen as soon as after taking the first dose of CIPRO. Talk to your healthcare provider right away if you get any of these side effects, or other changes in mood or behavior:
  • seizures
  • trouble sleeping
  • hear voices, see things, or sense things that are not there (hallucinations)
  • nightmares
  • feel lightheaded or dizzy
  • feel more suspicious (paranoia)
  • feel restless
  • suicidal thoughts or acts
  • tremors
  • headaches that will not go away, with or without blurred vision
  • feel anxious or nervous
  • confusion
  • depression
• Intestine infection (Pseudomembranous colitis). Pseudomembranous colitis can happen with many antibacterial medicines, including CIPRO. Call your healthcare provider right away if you get watery diarrhea, diarrhea that does not go away, or bloody stools. You may have stomach cramps and a fever. Pseudomembranous colitis can happen 2 or more months after you have finished your antibacterial medicine.
• Changes in sensation and possible nerve damage (Peripheral Neuropathy). Damage to the nerves in arms, hands, legs, or feet can happen in people who take fluoroquinolones, including CIPRO. Talk with your healthcare provider right away if you get any of the following symptoms of peripheral neuropathy in your arms, hands, legs, or feet:
  • pain
  • burning
  • tingling
  • numbness
  • weakness
    CIPRO may need to be stopped to prevent permanent nerve damage.
• Serious heart rhythm changes (QT prolongation and torsade de pointes). Tell your healthcare provider right away if you have a change in your heart beat (a fast or irregular heartbeat), or if you faint. CIPRO may cause a rare heart problem known as prolongation of the QT interval. This condition can cause an abnormal heartbeat and can be very dangerous. The chances of this event are higher in people:
  • who are elderly
  • with a family history of prolonged QT interval
  • with low blood potassium (hypokalemia)
  • who take certain medicines to control heart rhythm (antiarrhythmics)
• Joint Problems. Increased chance of problems with joints and tissues around joints in children under 18 years old can happen. Tell your child’s healthcare provider if your child has any joint problems during or after treatment with CIPRO.
• Sensitivity to sunlight (photosensitivity). See “What should I avoid while taking CIPRO?”

The most common side effects of CIPRO include:

• nausea
• diarrhea
• changes in liver function tests
• vomiting
• rash

Tell your healthcare provider about any side effect that bothers you, or that does not go away.

These are not all the possible side effects of CIPRO. For more information, ask your healthcare provider or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1800-FDA-1088.

How should I store CIPRO?

CIPRO Tablets

• Store at 20° to 25°C (68° to 77°F); excursions permitted to 15° to 30°C (59° to 86°F).

CIPRO Oral Suspension

• Store microcapsules and diluent below 25°C (77°F); excursions are permitted from 15°C to 30°C (59°F to 86°F).
• Do not freeze.
• After your CIPRO treatment is finished, safely throw away any unused oral suspension.

CIPRO XR

• Store CIPRO XR between 59°F to 86°F (15°C to 30°C).

Keep CIPRO and all medicines out of the reach of children.

General Information about the safe and effective use of CIPRO.

Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use CIPRO for a condition for which it is not prescribed. Do not give CIPRO to other people, even if they have the same symptoms that you have. It may harm them.

This Medication Guide summarizes the most important information about CIPRO. If you would like more information about CIPRO, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about CIPRO that is written for healthcare professionals.

For more information call 1-888-842-2937.

What are the ingredients in CIPRO?

CIPRO Tablets:

• Active ingredient: ciprofloxacin hydrochloride
• Inactive ingredients: cornstarch, microcrystalline cellulose, silicon dioxide, crospovidone, magnesium stearate, hypromellose, titanium dioxide, and polyethylene glycol

CIPRO Oral Suspension:

• Active ingredient: ciprofloxacin hydrochloride
• Inactive ingredients:
  • Microcapsules contains: povidone, methacrylic acid copolymer, hypromellose, magnesium stearate, and Polysorbate 20
  • Diluent contains: medium-chain triglycerides, sucrose, soy-lecithin, water, and strawberry flavor

CIPRO XR:

• Active ingredient: ciprofloxacin hydrochloride
• Inactive ingredients: crospovidone, hypromellose, magnesium stearate, polyethylene glycol, silicaa colloidal anhydrous, succinic acid, and titanium dioxide

CIPRO IV:

• Active ingredient: ciprofloxacin
• Inactive ingredients: lactic acid as a solubilizing agent, hydrochloric acid for pH adjustment

This Medication Guide has been approved by the U.S. Food and Drug Administration.

Description of Cipro I.V.

CIPRO IV (ciprofloxacin) is a synthetic antimicrobial agent for intravenous (IV) administration. Ciprofloxacin, a fluoroquinolone, is 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1piperazinyl)-3quinolinecarboxylic acid. Its empirical formula is C₁₇H₁₈FN₃O₃ and its chemical structure is:

Ciprofloxacin is a faint to light yellow crystalline powder with a molecular weight of 331.4. It is soluble in dilute (0.1N) hydrochloric acid and is practically insoluble in water and ethanol. CIPRO IV solutions are available as sterile 0.2% ready-for-use infusion solutions in 5% Dextrose Injection. CIPRO IV contains lactic acid as a solubilizing agent and hydrochloric acid for pH adjustment. The pH range for the 0.2% ready-for-use infusion solutions is 3.5 to 4.6.

The plastic container is not made with natural rubber latex.. Solutions in contact with the plastic container can leach out certain of its chemical components in very small amounts within the expiration period, for example, di(2-ethylhexyl) phthalate (DEHP), up to 5 parts per million. The suitability of the plastic has been confirmed in tests in animals according to USP biological tests for plastic containers as well as by tissue culture toxicity studies.

The glucose content for the 200 mL flexible container is 10 g.

CIPRO IV is indicated for the treatment of infections caused by susceptible isolates of the designated microorganisms in the conditions and patient populations listed below when the intravenous administration is needed [see DOSAGE AND ADMINISTRATION].

Urinary Tract Infections

CIPRO IV is indicated in adult patients for treatment of urinary tract infections caused by Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Serratia marcescens, Proteus mirabilis, Providencia rettgeri, Morganella morganii, Citrobacter koseri, Citrobacter freundii, Pseudomonas aeruginosa, methicillin-susceptible Staphylococcus epidermidis, Staphylococcus saprophyticus, or Enterococcus faecalis.

Lower Respiratory Tract Infections

CIPRO IV is indicated in adult patients for treatment of lower respiratory tract infections caused by Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Proteus mirabilis, Pseudomonas aeruginosa, Haemophilus influenzae, Haemophilus parainfluenzae, or Streptococcus pneumoniae.* Also, CIPRO IV is indicated for the treatment of acute exacerbations of chronic bronchitis caused by Moraxella catarrhalis [see Limitation of Use].

Nosocomial Pneumonia

CIPRO IV is indicated in adult patients for treatment of nosocomial pneumonia caused by caused by Haemophilus influenzae or Klebsiella pneumoniae.

Skin And Skin Structure Infections

CIPRO IV is indicated in adult patients for treatment of skin and skin structure infections caused by Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Proteus mirabilis, Proteus vulgaris, Providencia stuartii, Morganella morganii, Citrobacter freundii, Pseudomonas aeruginosa, methicillinsusceptible Staphylococcus aureus, methicillin-susceptible Staphylococcus epidermidis, or Streptococcus pyogenes.

Bone And Joint Infections

CIPRO IV is indicated in adult patients for treatment of bone and joint infections caused by Enterobacter cloacae, Serratia marcescens, or Pseudomonas aeruginosa.

Complicated Intra-Abdominal Infections

CIPRO IV is indicated in adult patients for treatment of complicated intra-abdominal infections (used in combination with metronidazole) caused by Escherichia coli, Pseudomonas aeruginosa, Proteus mirabilis, Klebsiella pneumoniae, or Bacteroides fragilis.

Acute Sinusitis

CIPRO IV is indicated in adult patients for treatment of acute sinusitis caused by Haemophilus influenzae, Streptococcus pneumoniae, or Moraxella catarrhalis.

Chronic Bacterial Prostatitis

CIPRO IV is indicated in adult patients for treatment of chronic bacterial prostatitis caused by Escherichia coli or Proteus mirabilis.

Empirical Therapy For Febrile Neutropenic Patients

CIPRO IV is indicated in adult patients for the treatment of febrile neutropenia in combination with piperacillin sodium [see Clinical Studies].

Complicated Urinary Tract Infections And Pyelonephritis

CIPRO IV is indicated in pediatric patients one to 17 years of age for treatment of complicated urinary tract infections (cUTI) and pyelonephritis due to Escherichia coli [see Limitation of Use, Use in Specific Populations, and Clinical Studies].

Inhalational Anthrax (post-exposure)

CIPRO IV is indicated in adults and pediatric patients from birth to 17 years of age for treatment of inhalational anthrax (post-exposure) to reduce the incidence or progression of disease following exposure to aerosolized Bacillus anthracis.

Ciprofloxacin serum concentrations achieved in humans served as a surrogate endpoint reasonably likely to predict clinical benefit and provided the initial basis for approval of this indication.¹ Supportive clinical information for ciprofloxacin for anthrax post-exposure prophylaxis was obtained during the anthrax bioterror attacks of October 2001. [See Clinical Studies]

Plague

CIPRO IV is indicated for treatment of plague, including pneumonic and septicemic plague, due to Yersinia pestis (Y. pestis) and prophylaxis for plague in adults and pediatric patients from birth to 17 years of age. Efficacy studies of ciprofloxacin could not be conducted in humans with plague for feasibility reasons. Therefore this indication is based on an efficacy study conducted in animals only [see Clinical Studies].

Limitation Of Use

Use in Pediatric Patients

Although effective in clinical trials, ciprofloxacin is not a drug of first choice in the pediatric population due to an increased incidence of adverse events compared to controls, including events related to joints and/or surrounding tissues. CIPRO IV, like other fluoroquinolones, is associated with arthropathy and histopathological changes in weight-bearing joints of juvenile animals [see WARNINGS AND PRECAUTIONS, ADVERSE REACTIONS, Use In Specific Populations, and Nonclinical Toxicology].

Lower Respiratory Tract Infections

CIPRO IV is not a drug of first choice in the treatment of presumed or confirmed pneumonia secondary to Streptococcus pneumoniae.

Usage

To reduce the development of drug-resistant bacteria and maintain the effectiveness of CIPRO IV and other antibacterial drugs, CIPRO IV should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

If anaerobic organisms are suspected of contributing to the infection, appropriate therapy should be administered. Appropriate culture and susceptibility tests should be performed before treatment in order to isolate and identify organisms causing infection and to determine their susceptibility to ciprofloxacin. Therapy with CIPRO IV may be initiated before results of these tests are known; once results become available appropriate therapy should be continued. As with other drugs, some isolates of Pseudomonas aeruginosa may develop resistance fairly rapidly during treatment with ciprofloxacin. Culture and susceptibility testing performed periodically during therapy will provide information not only on the therapeutic effect of the antimicrobial agent but also on the possible emergence of bacterial resistance.

Dosage And Administration of Cipro I.V.

CIPRO IV should be administered intravenously at dosages described in the appropriate Dosage Guidelines tables.

Dosage In Adults

The determination of dosage and duration for any particular patient must take into consideration the severity and nature of the infection, the susceptibility of the causative microorganism, the integrity of the patient’s host-defense mechanisms, and the status of renal and hepatic function.

Table 1: Adult Dosage Guidelines

Infection1	Dose	Frequency	Usual Duration
Urinary Tract	200 mg to 400 mg	every 12 to every 8 hours	7–14 days
Lower Respiratory Tract	400 mg	every 12 to every 8 hours	7–14 days
Nosocomial Pneumonia	400 mg	every 8 hours	10–14 days
Skin and Skin Structure	400 mg	every 12 to every 8 hours	7–14 days
Bone and Joint	400 mg	every 12 to every 8 hours	4 to 8 weeks
Complicated Intra-Abdominal2	400 mg	every 12 hours	7-14 days
Acute Sinusitis	400 mg	every 12 hours	10 days
Chronic Bacterial prostatitis	400 mg	every 12 hours	28 days
Empirical Therapy In Febrile Neutropenic Patients	CIPRO IV 400 mg and Piperacillin 50 mg/kg	every 8 hours	7-14 days
		every 4 hours
Inhalational anthrax(post-exposure)3	400 mg	every 12 hours	60 days
Plague3	400 mg	every 12 to 8 hours	14 days
1Due to the designated pathogens. 2Used in conjunction with metronidazole. 3Begin administration as soon as possible after suspected or confirmed exposure.

Conversion of Intravenous to Oral Dosing in Adults

Patients whose therapy is started with CIPRO IV may be switched to CIPRO Tablets or Oral Suspension when clinically indicated at the discretion of the physician (Table 2) [see CLINICAL PHARMACOLOGY].

Table 2: Equivalent AUC Dosing Regimens

CIPRO Oral Dosage	Equivalent CIPRO IV Dosage
250 mg Tablet every 12 hours	200 mg intravenous every 12 hours
500 mg Tablet every 12 h	400 mg intravenous every 12 hours
750 mg Tablet every 12 hours	400 mg intravenous every 8 hours

Dosage In Pediatric Patients

Dosing and initial route of therapy (that is, IV or oral) for cUTI or pyelonephritis should be determined by the severity of the infection.

Table 3: Pediatric Dosage Guidelines

Infection	Dose (mg/kg)	Frequency	Total Duration
Complicated Urinary Tract or Pyelonephritis (patients from 1 to 17 years of age)1	6 mg/kg to 10 mg/kg (maximum 400 mg per dose; not to be exceeded even in patients weighing more than 51 kg)	Every 8 hours	10-21 days1
Inhalational Anthrax (Post-Exposure)2	10 mg/kg (maximum 400 mg per dose)	Every 12 hours	60 days
Plague2,3	10 mg/kg (maximum 400 mg per dose)	Every 12 to 8 hours	10-21 days
1The total duration of therapy for cUTI and pyelonephritis in the clinical trial was determined by the physician. The mean duration of treatment was 11 days (range 10 to 21 days). 2Begin drug administration as soon as possible after suspected or confirmed exposure. 3Begin drug administration as soon as possible after suspected or confirmed exposure to Y. pestis.

Dosage Modifications In Patients With Renal Impairment

Ciprofloxacin is eliminated primarily by renal excretion; however, the drug is also metabolized and partially cleared through the biliary system of the liver and through the intestine. These alternative pathways of drug elimination appear to compensate for the reduced renal excretion in patients with renal impairment. Nonetheless, some modification of dosage is recommended, particularly for patients with severe renal dysfunction. Dosage guidelines for use in patients with renal impairment are shown in Table 4.

Table 4: Recommended Starting and Maintenance Doses for Adult Patients with Impaired Renal Function

Creatinine Clearance (mL/min)	Dose
> 30	See Usual Dosage.
5-29	200-400 mg every 18-24 hours

When only the serum creatinine concentration is known, the following formulas may be used to estimate creatinine clearance:

Males:	(weight in kg) x (140 – age)
	(72) x serum creatinine (mg/100 mL)
Females	(0.85) x (above value)

The serum creatinine should represent a steady state of renal function.

In patients with severe infections and severe renal impairment and hepatic insufficiency, careful monitoring is suggested.

Pediatric patients with moderate to severe renal insufficiency were excluded from the clinical trial of cUTI and pyelonephritis. No information is available on dosing adjustments necessary for pediatric patients with moderate to severe renal insufficiency (that is, creatinine clearance of < 50 mL/min/1.73m²).

Preparation Of CIPRO IV For Administration

Flexible Containers

CIPRO IV is available as a 0.2% premixed solution in 5% dextrose in flexible containers of 200 mL. The solutions in flexible containers do not need to be diluted and may be infused as described above.

Important Administration Instructions

Intravenous Infusion

CIPRO IV should be administered to by intravenous infusion over a period of 60 minutes. Slow infusion of a dilute solution into a larger vein will minimize patient discomfort and reduce the risk of venous irritation.

Hydration of Patients Receiving CIPRO IV

Adequate hydration of patients receiving CIPRO IV should be maintained to prevent the formation of highly concentrated urine. Crystalluria has been reported with quinolones [see WARNINGS AND PRECAUTIONS, ADVERSE REACTIONS, Nonclinical Toxicology and PATIENT INFORMATION].

How Supplied

Dosage Forms And Strengths

Injection (200 mL in 5% Dextrose, 400 mg, 0.2%) Premix in Flexible Containers, for intravenous infusion

Storage And Handling

CIPRO IV (ciprofloxacin) is available as a clear, colorless to slightly yellowish solution in flexible containers not made with natural rubber latex.

SIZE	STRENGTH	NDC NUMBER
200 mL	5% Dextrose 400 mg, 0.2%	50419-759-01

Storage

Store between 5–25°C (41–77°F).

Protect from light, avoid excessive heat, protect from freezing.

Ciprofloxacin is also available as CIPRO (ciprofloxacin HCl) Tablets 250, 500 mg and CIPRO (ciprofloxacin*) 5% and 10% Oral Suspension.

REFERENCES

1. 21 CFR 314.510 (Subpart H–Accelerated Approval of New Drugs for Life-Threatening Illnesses).

Bayer HealthCare Pharmaceuticals Inc. Whippany, NJ 07981. Manufactured in Germany. Revised: March 2015

The following serious and otherwise important adverse drug reactions are discussed in greater detail in other sections of labeling:

• Tendon Effects [see WARNINGS AND PRECAUTIONS]
• Exacerbation of Myasthenia Gravis [see WARNINGS AND PRECAUTIONS]
• Hypersensitivity Reactions [see WARNINGS AND PRECAUTIONS]
• Other Serious and Sometimes Fatal Reactions [see WARNINGS AND PRECAUTIONS]
• Hepatotoxicity [see WARNINGS AND PRECAUTIONS]
• Serious Adverse Reactions with Concomitant Theophylline [see WARNINGS AND PRECAUTIONS]
• Central Nervous System Effects [see WARNINGS AND PRECAUTIONS]
• Clostridium Difficile-Associated Diarrhea [see WARNINGS AND PRECAUTIONS]
• Peripheral Neuropathy [see WARNINGS AND PRECAUTIONS]
• Prolongation of the QT Interval [see WARNINGS AND PRECAUTIONS]
• Musculoskeletal Disorders in Pediatric Patients [see WARNINGS AND PRECAUTIONS]
• Photosensitivity/Phototoxicity [see WARNINGS AND PRECAUTIONS]
• Development of Drug Resistant Bacteria [see WARNINGS AND PRECAUTIONS]

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Adult Patients

During clinical investigations with oral and parenteral CIPRO IV, 49,038 patients received courses of the drug.

The most frequently reported adverse reactions, from clinical trials of all formulations, all dosages, all drug-therapy durations, and for all indications of ciprofloxacin therapy were nausea (2.5%), diarrhea (1.6%), liver function tests abnormal (1.3%), vomiting (1%), and rash (1%).

In clinical trials the following adverse reactions were reported in greater than 1% of patients treated with intravenous CIPRO IV: nausea, diarrhea, central nervous system disturbance, local intravenous site reactions, liver function tests abnormal, eosinophilia, headache, restlessness, and rash. Local intravenous site reactions are more frequent if the infusion time is 30 minutes or less. These may appear as local skin reactions that resolve rapidly upon completion of the infusion. Subsequent intravenous administration is not contraindicated unless the reactions recur or worsen.

Table 5: Medically Important Adverse Reactions That Occurred in less than 1% Ciprofloxacin Patients

System Organ Class	Adverse Reactions
Body as a Whole	Abdominal Pain/Discomfort Pain
Cardiovascular	Cardiopulmonary Arrest Myocardial Infarction Tachycardia Syncope Hypertension Angina Pectoris Vasodilation
Central Nervous System	Restlessness Seizures (including Status Epilepticus) Paranoia Psychosis (toxic) Depression (potentially culminating in self-injurious behavior, such as suicidal ideations/thoughts and attempted or completed suicide) Phobia Depersonalization Manic Reaction Unresponsiveness Ataxia Hallucinations Dizziness Paresthesia Tremor Insomnia Nightmares Irritability Malaise Abnormal Gait Migraine
Gastrointestinal	Ileus Gastrointestinal Bleeding Pancreatitis Hepatic Necrosis Intestinal Perforation Dyspepsia Constipation Oral Ulceration Mouth Dryness Anorexia Flatulence Hepatitis
Hemic/Lymphatic	Agranulocytosis Prolongation of Prothrombin Time Petechia
Metabolic/Nutritional	Hyperglycemia Hypoglycemia
Musculoskeletal	Arthralgia Joint Stiffness Muscle Weakness
Ren al/U rogenital	Renal Failure Interstitial Nephritis Hemorrhagic Cystitis Renal Calculi Frequent Urination Gynecomastia Crystalluria Cylindruria Hematuria Albuminuria
Respiratory	Respiratory Arrest Dyspnea Laryngeal Edema Hemoptysis Bronchospasm
Skin/Hypersensitivity	Allergic Reactions Anaphylactic Reactions including life-threatening anaphylactic shock Erythema Multiforme/Stevens-Johnson Syndrome Exfoliative Dermatitis Toxic Epidermal Necrolysis Vasculitis Angioedema
	extremities Purpura Fever Pruritus Urticaria Increased Perspiration Erythema Nodosum Thrombophlebitis Burning Photosensitivity/Phototoxicity Reaction
Special Senses	Decreased Visual Acuity Blurred Vision Disturbed Vision (diplopia, chromatopsia, and photopsia) Anosmia Hearing Loss Tinnitus Nystagmus Bad Taste

In several instances, nausea, vomiting, tremor, irritability, or palpitation were judged by investigators to be related to elevated serum levels of theophylline possibly as a result of drug interaction with ciprofloxacin.

In randomized, double-blind controlled clinical trials comparing CIPRO (Intravenous and Intravenous/Oral. sequential) with intravenous beta-lactam control antibiotics, the CNS adverse reaction profile of CIPRO was comparable to that of the control drugs.

Pediatric Patients

Short (6 weeks) and long term (1 year) musculoskeletal and neurological safety of oral/intravenous ciprofloxacin was compared to a cephalosporin for treatment of cUTI or pyelonephritis in pediatric patients 1 to 17 years of age (mean age of 6 ± 4 years) in an international multicenter trial. The duration of therapy was 10 to 21 days (mean duration of treatment was 11 days with a range of 1 to 88 days). A total of 335 ciprofloxacin-and 349 comparator-treated patients were enrolled.

An Independent Pediatric Safety Committee (IPSC) reviewed all cases of musculoskeletal adverse reactions including abnormal gait or abnormal joint exam (baseline or treatment-emergent). Within 6 weeks of treatment initiation, the rates of musculoskeletal adverse reactions were 9.3% (31/335) in the ciprofloxacin-treated group versus 6% (21/349) in comparator-treated patients. All musculoskeletal adverse reactions occurring by 6 weeks resolved (clinical resolution of signs and symptoms), usually within 30 days of end of treatment. Radiological evaluations were not routinely used to confirm resolution of the adverse reactions. Ciprofloxacin-treated patients were more likely to report more than one adverse reaction and on more than one occasion compared to control patients. The rate of musculoskeletal adverse reactions was consistently higher in the ciprofloxacin group compared to the control group across all age subgroups. At the end of 1 year, the rate of these adverse reactions reported at any time during that period was 13.7% (46/335) in the ciprofloxacin-treated group versus 9.5% (33/349) in the comparator-treated patients (Table 6).

Table 6: Musculoskeletal Adverse Reactions¹ as Assessed by the IPSC

	CIPRO	Comparator
All Patients (within 6 weeks)	31/335 (9.3%)	21/349 (6%)
95% Confidence Interval2	(-0.8%, +7.2%)
Age Group
12 months to 24 months	1/36 (2.8%)	0/41
2 years to < 6 years	5/124 (4%)	3/118 (2.5%)
6 years to < 12 years	18/143 (12.6%)	12/153 (7.8%)
12 years to 17 years	7/32 (21.9%)	6/37 (16.2 %)
All Patients (within 1 year)	46/335 (13.7%)	33/349 (9.5%)
95% Confidence Interval2	(-0.6%, + 9.1%)
1Included: arthralgia, abnormal gait, abnormal joint exam, joint sprains, leg pain, back pain, arthrosis, bone pain, pain, myalgia, arm pain, and decreased range of motion in a joint (knee, elbow, ankle, hip, wrist, and shoulder) 2The study was designed to demonstrate that the arthropathy rate for the CIPRO group did not exceed that of the control group by more than + 6%. At both the 6 week and 1 year evaluations, the 95% confidence interval indicated that it could not be concluded that the ciprofloxacin group had findings comparable to the control group.

The incidence rates of neurological adverse reactions within 6 weeks of treatment initiation were 3% (9/335) in the ciprofloxacin group versus 2% (7/349) in the comparator group and included dizziness, nervousness, insomnia, and somnolence.

In this trial, the overall incidence rates of adverse reactions within 6 weeks of treatment initiation were 41% (138/335) in the ciprofloxacin group versus 31% (109/349) in the comparator group. The most frequent adverse reactions were gastrointestinal: 15% (50/335) of ciprofloxacin patients compared to 9% (31/349) of comparator patients. Serious adverse reactions were seen in 7.5% (25/335) of ciprofloxacintreated patients compared to 5.7% (20/349) of control patients. Discontinuation of drug due to an adverse reaction was observed in 3% (10/335) of ciprofloxacin-treated patients versus 1.4% (5/349) of comparator patients. Other adverse events that occurred in at least 1% of ciprofloxacin patients were diarrhea 4.8%, vomiting 4.8%, abdominal pain 3.3%, dyspepsia 2.7%, nausea 2.7%, fever 2.1%, asthma 1.8% and rash 1.8%.

Short-term safety data for ciprofloxacin was also collected in a randomized, double-blind clinical trial for the treatment of acute pulmonary exacerbations in cystic fibrosis patients (ages 5–17 years). Sixty seven patients received CIPRO IV 10 mg/kg/dose every 8 hours for one week followed by CIPRO tablets 20 mg/kg/dose every 12 hours to complete 10–21 days treatment and 62 patients received the combination of ceftazidime intravenous 50 mg/kg/dose every 8 hours and tobramycin intravenous 3 mg/kg/dose every 8 hours for a total of 10–21 days. Periodic musculoskeletal assessments were conducted by treatment-blinded examiners. Patients were followed for an average of 23 days after completing treatment (range 0– 93 days). Musculoskeletal adverse reactions were reported in 22% of the patients in the ciprofloxacin group and 21% in the comparison group. Decreased range of motion was reported in 12% of the subjects in the ciprofloxacin group and 16% in the comparison group. Arthralgia was reported in 10% of the patients in the ciprofloxacin group and 11% in the comparison group. Other adverse reactions were similar in nature and frequency between treatment arms. The efficacy of CIPRO for the treatment of acute pulmonary exacerbations in pediatric cystic fibrosis patients has not been established.

In addition to the adverse reactions reported in pediatric patients in clinical trials, it should be expected that adverse reactions reported in adults during clinical trials or postmarketing experience may also occur in pediatric patients.

Postmarketing Experience

The following adverse reactions have been reported from worldwide marketing experience with fluoroquinolones, including CIPRO IV. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure (Table 7).

Table 7: Postmarketing Reports of Adverse Drug Reactions

System Organ Class	Adverse Reactions
Cardiovascular	QT prolongation Torsade de Pointes Vasculitis and ventricular arrhythmia
Central Nervous System	Hypertonia Myasthenia Exacerbation of myasthenia gravis Peripheral neuropathy Polyneuropathy Twitching
Eye Disorders	Nystagmus
Gastrointestinal	Pseudomembranous colitis
Hemic/Lymphatic	Pancytopenia (life threatening or fatal outcome) Methemoglobinemia
Hepatobiliary	Hepatic failure (including fatal cases)
Infections and Infestations	Candidiasis (oral, gastrointestinal, vaginal)
Investigations	Prothrombin time prolongation or decrease Cholesterol elevation (serum) Potassium elevation (serum)
Musculoskeletal	Myalgia Myoclonus Tendinitis Tendon rupture
Psychiatric Disorders	Agitation Confusion Delirium
Skin/Hypersensitivity	Acute generalize exanthematous pustulosis (AGEP) Fixed eruption Serum sickness-like reaction
Special Senses	Anosmia Hyperesthesia Hypesthesia Taste loss

Adverse Laboratory Changes

Changes in laboratory parameters while on CIPRO IV therapy are listed below:

• Hepatic-Elevations of AST (SGOT), ALT (SGPT), alkaline phosphatase, LDH, and serum bilirubin
• Hematologic-Elevated eosinophil and platelet counts, decreased platelet counts, hemoglobin and/or hematocrit
• Renal-Elevations of serum creatinine, BUN, and uric acid
• Other elevations of serum creatine phosphokinase, serum theophylline (in patients receiving theophylline concomitantly), blood glucose, and triglycerides

Other changes occurring were: decreased leukocyte count, elevated atypical lymphocyte count, immature WBCs, elevated serum calcium, elevation of serum gamma-glutamyl transpeptidase (gGT), decreased BUN, decreased uric acid, decreased total serum protein, decreased serum albumin, decreased serum potassium, elevated serum potassium, elevated serum cholesterol. Other changes occurring during administration of ciprofloxacin were: elevation of serum amylase, decrease of blood glucose, pancytopenia, leukocytosis, elevated sedimentation rate, change in serum phenytoin, decreased prothrombin time, hemolytic anemia, and bleeding diathesis.

Ciprofloxacin is an inhibitor of human cytochrome P450 1A2 (CYP1A2) mediated metabolism. Coadministration of CIPRO IV with other drugs primarily metabolized by CYP1A2 results in increased plasma concentrations of these drugs and could lead to clinically significant adverse events of the coadministered drug.

Table 8: Drugs That are Affected by and Affecting CIPRO IV

Drugs That are Affected by CIPRO IV
Drug(s)	Recommendation	Comments
Tizanidine	Contraindicated	Concomitant administration of tizanidine and CIPRO IV is contraindicated due to the potentiation of hypotensive and sedative effects of tizanidine [see CONTRAINDICATIONS]
Theophylline	Avoid Use (Plasma Exposure Likely to be Increased and Prolonged)	Concurrent administration of CIPRO IV with theophylline may result in increased risk of a patient developing central nervous system (CNS) or other adverse reactions. If concomitant use cannot be avoided, monitor serum levels of theophylline and adjust dosage as appropriate. [See WARNINGS AND PRECAUTIONS.]
Drugs Known to Prolong QT Interval	Avoid Use	CIPRO IV may further prolong the QT interval in patients receiving drugs known to prolong the QT interval (for example, class IA or III antiarrhythmics, tricyclic antidepressants, macrolides, antipsychotics) [see WARNINGS AND PRECAUTIONS and Use in Specific Populations].
Oral antidiabetic drugs	Use with caution Glucose-lowering effect potentiated	Hypoglycemia sometimes severe has been reported when CIPRO IV and oral antidiabetic agents, mainly sulfonylureas (for example, glyburide, glimepiride), were co-administered, presumably by intensifying the action of the oral antidiabetic agent. Fatalities have been reported. Monitor blood glucose when ciprofloxacin is co-administered with oral antidiabetic drugs. [See ADVERSE REACTIONS]
Phenytoin	Use with caution Altered serum levels of phenytoin (increased and decreased)	To avoid the loss of seizure control associated with decreased phenytoin levels and to prevent phenytoin overdose-related adverse reactions upon CIPRO IV discontinuation in patients receiving both agents, monitor phenytoin therapy, including phenytoin serum concentration during and shortly after co-administration of CIPRO IV with phenytoin.
Cyclosporine	Use with caution (transient elevations in serum creatinine)	Monitor renal function (in particular serum creatinine) when ciprofloxacin is co-administered with cyclosporine.
Anti-coagulant drugs	Use with caution (Increase in anticoagulant effect)	The risk may vary with the underlying infection, age and general status of the patient so that the contribution of CIPRO IV to the increase in INR (international normalized ratio) is difficult to assess. Monitor prothrombin time and INR frequently during and shortly after co-administration of CIPRO IV with an oral anticoagulant (for example, warfarin).
Methotrexate	Use with caution Inhibition of methotrexate renal tubular transport potentially leading to increased methotrexate plasma levels	Potential increase in the risk of methotrexate associated toxic reactions. Therefore, carefully monitor patients under methotrexate therapy when concomitant CIPRO IV therapy is indicated.
Ropinirole	Use with caution	Monitoring for ropinirole-related adverse reactions and appropriate dose adjustment of ropinirole is recommended during and shortly after co-administration with CIPRO IV [see WARNINGS AND PRECAUTIONS].
Clozapine	Use with caution	Careful monitoring of clozapine associated adverse reactions and appropriate adjustment of clozapine dosage during and shortly after co-administration with CIPRO IV are advised.
NSAIDs	Use with caution	Non-steroidal anti-inflammatory drugs (but not acetyl salicylic acid) in combination of very high doses of quinolones have been shown to provoke convulsions in pre-clinical studies and in postmarketing.
Sildenafil	Use with caution Two-fold increase in exposure	Monitor for sildenafil toxicity (see Pharmacokinetics).
Duloxetine	Avoid Use Five-fold increase in duloxetine exposure	If unavoidable, monitor for duloxetine toxicity
Caffeine/Xanthine Derivatives	Use with caution Reduced clearance resulting in elevated levels and prolongation of serum half-life	CIPRO IV inhibits the formation of paraxanthine after caffeine administration (or pentoxifylline containing products). Monitor for xanthine toxicity and adjust dose as necessary.
Drug(s) Affecting Pharmacokinetics of CIPRO
Probenecid	Use with caution (interferes with renal tubular secretion of CIPRO and increases CIPRO serum levels)	Potentiation of CIPRO IV toxicity may occur.

Warnings

Included as part of the PRECAUTIONS section.

Precautions

Tendinopathy And Tendon Rupture

Fluoroquinolones, including CIPRO IV, are associated with an increased risk of tendinitis and tendon rupture in all ages. This adverse reaction most frequently involves the Achilles tendon, and rupture of the Achilles tendon may require surgical repair. Tendinitis and tendon rupture in the rotator cuff (the shoulder), the hand, the biceps, the thumb, and other tendon sites have also been reported. The risk of developing fluoroquinolone-associated tendinitis and tendon rupture is further increased in older patients usually over 60 years of age, in patients taking corticosteroid drugs, and in patients with kidney, heart or lung transplants. Factors, in addition to age and corticosteroid use, that may independently increase the risk of tendon rupture include strenuous physical activity, renal failure, and previous tendon disorders such as rheumatoid arthritis. Tendinitis and tendon rupture have also occurred in patients taking fluoroquinolones who do not have the above risk factors. Inflammation and tendon rupture can occur, sometimes bilaterally, even within the first 48 hours, during or after completion of therapy; cases occurring up to several months after completion of therapy have been reported. CIPRO IV should be used with caution in patients with a history of tendon disorders. CIPRO IV should be discontinued if the patient experiences pain, swelling, inflammation or rupture of a tendon. [See ADVERSE REACTIONS]

Exacerbation Of Myasthenia Gravis

Fluoroquinolones, including CIPRO IV, have neuromuscular blocking activity and may exacerbate muscle weakness in persons with myasthenia gravis. Postmarketing serious adverse events, including deaths and requirement for ventilatory support, have been associated with fluoroquinolone use in persons with myasthenia gravis. Avoid CIPRO in patients with known history of myasthenia gravis. [See ADVERSE REACTIONS]

Hypersensitivity Reactions

Serious and occasionally fatal hypersensitivity (anaphylactic) reactions, some following the first dose, have been reported in patients receiving quinolone therapy, including CIPRO IV. Some reactions were accompanied by cardiovascular collapse, loss of consciousness, tingling, pharyngeal or facial edema, dyspnea, urticaria, and itching. Only a few patients had a history of hypersensitivity reactions. Serious anaphylactic reactions require immediate emergency treatment with epinephrine and other resuscitation measures, including oxygen, intravenous fluids, intravenous antihistamines, corticosteroids, pressor amines, and airway management, including intubation, as indicated. [See ADVERSE REACTIONS].

Other Serious And Sometimes Fatal Reactions

Other serious and sometimes fatal events, some due to hypersensitivity, and some due to uncertain etiology, have been reported in patients receiving therapy with quinolones, including CIPRO IV. These events may be severe and generally occur following the administration of multiple doses. Clinical manifestations may include one or more of the following:

• Fever, rash, or severe dermatologic reactions (for example, toxic epidermal necrolysis, Stevens-Johnson syndrome);
• Vasculitis; arthralgia; myalgia; serum sickness;
• Allergic pneumonitis;
• Interstitial nephritis; acute renal insufficiency or failure;
• Hepatitis; jaundice; acute hepatic necrosis or failure;
• Anemia, including hemolytic and aplastic; thrombocytopenia, including thrombotic thrombocytopenic purpura; leukopenia; agranulocytosis; pancytopenia; and/or other hematologic abnormalities.

Discontinue CIPRO IV immediately at the first appearance of a skin rash, jaundice, or any other sign of hypersensitivity and supportive measures instituted [see ADVERSE REACTIONS].

Hepatotoxicity

Cases of severe hepatotoxicity, including hepatic necrosis, life-threatening hepatic failure, and fatal events, have been reported with CIPRO IV. Acute liver injury is rapid in onset (range 1–39 days), and is often associated with hypersensitivity. The pattern of injury can be hepatocellular, cholestatic or mixed. Most patients with fatal outcomes were older than 55 years old. In the event of any signs and symptoms of hepatitis (such as anorexia, jaundice, dark urine, pruritus, or tender abdomen), discontinue treatment immediately.

There can be a temporary increase in transaminases, alkaline phosphatase, or cholestatic jaundice, especially in patients with previous liver damage, who are treated with CIPRO IV. [See ADVERSE REACTIONS]

Serious Adverse Reactions With Concomitant Theophylline

Serious and fatal reactions have been reported in patients receiving concurrent administration of Intravenous CIPRO and theophylline. These reactions have included cardiac arrest, seizure, status epilepticus, and respiratory failure. Instances of nausea, vomiting, tremor, irritability, or palpitation have also occurred.

Although similar serious adverse reactions have been reported in patients receiving theophylline alone, the possibility that these reactions may be potentiated by CIPRO cannot be eliminated. If concomitant use cannot be avoided, monitor serum levels of theophylline and adjust dosage as appropriate. [See DRUG INTERACTIONS]

Central Nervous System Effects

Convulsions, increased intracranial pressure (including pseudotumor cerebri), and toxic psychosis have been reported in patients receiving fluoroquinolones, including CIPRO IV. CIPRO IV may also cause central nervous system (CNS) events including: nervousness, agitation, insomnia, anxiety, nightmares, paranoia, dizziness, confusion, tremors, hallucinations, depression, and, psychotic reactions have progressed to suicidal ideations/thoughts and self-injurious behavior such as attempted or completed suicide. These reactions may occur following the first dose. Advise patients receiving CIPRO IV to inform their healthcare provider immediately if these reactions occur, discontinue the drug, and institute appropriate care. CIPRO IV, like other fluoroquinolones, is known to trigger seizures or lower the seizure threshold. As with all fluoroquinolones, use CIPRO with caution in epileptic patients and patients with known or suspected CNS disorders that may predispose to seizures or lower the seizure threshold (for example, severe cerebral arteriosclerosis, previous history of convulsion, reduced cerebral blood flow, altered brain structure, or stroke), or in the presence of other risk factors that may predispose to seizures or lower the seizure threshold (for example, certain drug therapy, renal dysfunction). Use CIPRO IV when the benefits of treatment exceed the risks, since these patients are endangered because of possible undesirable CNS side effects. Cases of status epilepticus have been reported. If seizures occur, discontinue CIPRO. [See ADVERSE REACTIONS and DRUG INTERACTIONS]

Clostridium Difficile-Associated Diarrhea

Clostridium Difficile (C. difficile)-associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including CIPRO IV, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing isolates of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibacterial use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibacterial use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibacterial treatment of C. difficile, and institute surgical evaluation as clinically indicated. [See ADVERSE REACTIONS]

Peripheral Neuropathy

Cases of sensory or sensorimotor axonal polyneuropathy affecting small and/or large axons resulting in paresthesias, hypoesthesias, dysesthesias and weakness have been reported in patients receiving fluoroquinolones, including CIPRO IV. Symptoms may occur soon after initiation of CIPRO IV and may be irreversible. Discontinue CIPRO IV immediately if the patient experiences symptoms of peripheral neuropathy including pain, burning, tingling, numbness, and/or weakness, or other alterations in sensations including light touch, pain, temperature, position sense and vibratory sensation, and/or motor strength in order to minimize the development of an irreversible condition. [See ADVERSE REACTIONS]

Prolongation Of The QT Interval

Some fluoroquinolones, including CIPRO IV, have been associated with prolongation of the QT interval on the electrocardiogram and cases of arrhythmia. Cases of torsade de pointes have been reported during postmarketing surveillance in patients receiving fluoroquinolones, including CIPRO IV. Avoid CIPRO IV in patients with known prolongation of the QT interval, risk factors for QT prolongation or torsade de pointes (for example, congenital long QT syndrome , uncorrected electrolyte imbalance, such as hypokalemia or hypomagnesemia and cardiac disease, such as heart failure, myocardial infarction, or bradycardia), and patients receiving Class IA antiarrhythmic agents (quinidine, procainamide), or Class III antiarrhythmic agents (amiodarone, sotalol), tricyclic antidepressants, macrolides, and antipsychotics. Elderly patients may also be more susceptible to drug-associated effects on the QT interval. [See ADVERSE REACTIONS and Use in Specific Populations]

Musculoskeletal Disorders In Pediatric Patients And Arthropathic Effects In Animals

CIPRO IV is indicated in pediatric patients (less than 18 years of age) only for cUTI, prevention of inhalational anthrax (post exposure), and plague [see INDICATIONS AND USAGE]. An increased incidence of adverse reactions compared to controls, including reactions related to joints and/or surrounding tissues, has been observed [see ADVERSE REACTIONS].

In pre-clinical studies, oral administration of CIPRO IV caused lameness in immature dogs. Histopathological examination of the weight-bearing joints of these dogs revealed permanent lesions of the cartilage. Related quinolone-class drugs also produce erosions of cartilage of weight-bearing joints and other signs of arthropathy in immature animals of various species. [See Use in Specific Populations and Nonclinical Toxicology]

Crystalluria

Crystals of ciprofloxacin have been observed rarely in the urine of human subjects but more frequently in the urine of laboratory animals, which is usually alkaline [see Nonclinical Toxicology]. Crystalluria related to ciprofloxacin has been reported only rarely in humans because human urine is usually acidic. Avoid alkalinity of the urine in patients receiving CIPRO IV. Hydrate patients well to prevent the formation of highly concentrated urine [see DOSAGE AND ADMINISTRATION].

Photosensitivity/Phototoxicity

Moderate to severe photosensitivity/phototoxicity reactions, the latter of which may manifest as exaggerated sunburn reactions (for example, burning, erythema, exudation, vesicles, blistering, edema) involving areas exposed to light (typically the face, “V” area of the neck, extensor surfaces of the forearms, dorsa of the hands), can be associated with the use of quinolones, including CIPRO IV, after sun or UV light exposure. Therefore, avoid excessive exposure to these sources of light. Discontinue CIPRO IV if phototoxicity occurs. [See ADVERSE REACTIONS]

Development Of Drug Resistant Bacteria

Prescribing CIPRO IV in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

Potential Risks With Concomitant Use Of Drugs Metabolized By Cytochrome P450 1A2 Enzymes

Ciprofloxacin is an inhibitor of the hepatic CYP1A2 enzyme pathway. Co-administration of CIPRO IV and other drugs primarily metabolized by CYP1A2 (for example, theophylline, methylxanthines, caffeine, tizanidine, ropinirole, clozapine, olanzapine) results in increased plasma concentrations of the coadministered drug and could lead to clinically significant pharmacodynamic adverse reactions of the coadministered drug. [See DRUG INTERACTIONS and CLINICAL PHARMACOLOGY]

Periodic Assessment Of Organ System Functions

As with any potent drug, periodic assessment of organ system functions, including renal, hepatic, and hematopoietic function, is advisable during prolonged therapy.

Patient Counseling Information

Advise the patient to read the FDA-Approved patient labeling (Medication Guide)

Antibacterial Resistance

Inform patients that antibacterial drugs including CIPRO IV should only be used to treat bacterial infections. They do not treat viral infections (for example, the common cold). When CIPRO IV prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by CIPRO IV or other antibacterial drugs in the future.

Administration

Inform patients to drink fluids liberally while taking CIPRO to avoid formation of highly concentrated urine and crystal formation in the urine.

Serious and Potentially Serious Adverse Reactions

Inform patients of the following serious adverse reactions that have been associated with CIPRO or other fluoroquinolone use:

• Tendon Disorders Instruct patients to contact their healthcare provider if they experience pain, swelling, or inflammation of a tendon, or weakness or inability to use one of their joints; rest and refrain from exercise; and discontinue CIPRO treatment. The risk of severe tendon disorder with fluoroquinolones is higher in older patients usually over 60 years of age, in patients taking corticosteroid drugs, and in patients with kidney, heart or lung transplants.
• Exacerbation of Myasthenia Gravis: Instruct patients to inform their physician of any history of myasthenia gravis. Instruct patients to notify their physician if they experience any symptoms of muscle weakness, including respiratory difficulties.
• Hypersensitivity Reactions: Inform patients that ciprofloxacin can cause hypersensitivity reactions, even following a single dose, and to discontinue the drug at the first sign of a skin rash, hives or other skin reactions, a rapid heartbeat, difficulty in swallowing or breathing, any swelling suggesting angioedema (for example, swelling of the lips, tongue, face, tightness of the throat, hoarseness), or other symptoms of an allergic reaction.
• Hepatotoxicity: Inform patients that severe hepatotoxicity (including acute hepatitis and fatal events) has been reported in patients taking CIPRO IV. Instruct patients to inform their physician if they experience any signs or symptoms of liver injury including: loss of appetite, nausea, vomiting, fever, weakness, tiredness, right upper quadrant tenderness, itching, yellowing of the skin and eyes, light colored bowel movements or dark colored urine.
• Convulsions: Inform patients that convulsions have been reported in patients receiving fluoroquinolones, including ciprofloxacin. Instruct patients to notify their physician before taking this drug if they have a history of convulsions.
• Neurologic Adverse Effects (for example, dizziness, lightheadedness, increased intracranial pressure): Inform patients that they should know how they react to CIPRO IV before they operate an automobile or machinery or engage in other activities requiring mental alertness and coordination. Instruct patients to notify their physician if persistent headache with or without blurred vision occurs.
• Diarrhea: Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, Instruct patients to contact their physician as soon as possible.
• Peripheral Neuropathies: Inform patients that peripheral neuropathies have been associated with ciprofloxacin use, symptoms may occur soon after initiation of therapy and may be irreversible If symptoms of peripheral neuropathy including pain, burning, tingling, numbness and/or weakness develop, immediately discontinue CIPRO IV and contact their physician.
• Prolongation of the QT Interval: Instruct patients to inform their physician of any personal or family history of QT prolongation or proarrhythmic conditions such as hypokalemia, bradycardia, or recent myocardial ischemia if they are taking any Class IA (quinidine, procainamide), or Class III (amiodarone, sotalol) antiarrhythmic agents. Instruct patients to notify their physician if they have any symptoms of prolongation of the QT interval, including prolonged heart palpitations or a loss of consciousness.
• Musculoskeletal Disorders in Pediatric Patients: Instruct parents to inform their child’s physician if the child has a history of joint-related problems before taking this drug. Inform parents of pediatric patients to notify their child’s physician of any joint-related problems that occur during or following ciprofloxacin therapy [see WARNINGS AND PRECAUTIONS and Use In Specific Populations].
• Tizanidine: Instruct patients not to use ciprofloxacin if they are already taking tizanidine. Ciprofloxacin increases the effects of tizanidine (Zanaflex®).
• Theophylline: Inform patients that ciprofloxacin CIPRO IV may increase the effects of theophylline. Life-threatening CNS effects and arrhythmias can occur. Advise the patients to immediately seek medical help if they experience seizures, palpitations, or difficulty breathing.
• Caffeine: Inform patients that ciprofloxacin may increase the effects of caffeine. There is a possibility of caffeine accumulation when products containing caffeine are consumed while taking quinolones.
• Photosensitivity/Phototoxicity: Inform patients that photosensitivity/phototoxicity has been reported in patients receiving fluoroquinolones. Inform patients to minimize or avoid exposure to natural or artificial sunlight (tanning beds or UVA/B treatment) while taking quinolones. If patients need to be outdoors while using quinolones, instruct them to wear loose-fitting clothes that protect skin from sun exposure and discuss other sun protection measures with their physician. If a sunburn-like reaction or skin eruption occurs, instruct patients to contact their physician.

Drug Interactions Oral Antidiabetic Agents

Inform patients that hypoglycemia has been reported when ciprofloxacin and oral antidiabetic agents were co-administered; if low blood sugar occurs with CIPRO IV, instruct them toconsult their physician and that their antibacterial medicine may need to be changed.

Anthrax and Plague Studies

Inform patients given CIPRO IV for this condition that efficacy studies could not be conducted in humans for ethical and feasibility reasons. Therefore, approval for these conditions was based on efficacy studies conducted in animals.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

A total of 8 in vitro mutagenicity tests have been conducted with ciprofloxacin, and the test results are listed below:

• • Salmonella/Microsome Test (Negative)
  • E. coli DNA Repair Assay (Negative)
  • Mouse Lymphoma Cell Forward Mutation Assay (Positive)
  • Chinese Hamster V 79 Cell HGPRT Test (Negative)
  • Syrian Hamster Embryo Cell Transformation Assay (Negative)

• Saccharomyces cerevisiae Point Mutation Assay (Negative)
• Saccharomyces cerevisiae Mitotic Crossover and Gene Conversion Assay (Negative)
• Rat Hepatocyte DNA Repair Assay (Positive)
• Thus, 2 of the 8 tests were positive, but results of the following 3 in vivo test systems gave negative results:
• Rat Hepatocyte DNA Repair Assay
• Micronucleus Test (Mice)
• Dominant Lethal Test (Mice)

Long-term carcinogenicity studies in rats and mice resulted in no carcinogenic or tumorigenic effects due to ciprofloxacin at daily oral dose levels up to 250 mg/kg and 750 mg/kg to rats and mice, respectively (approximately 1.7-times and 2.5-times the highest recommended therapeutic dose based upon body surface area, respectively).

Results from photo co-carcinogenicity testing indicate that ciprofloxacin does not reduce the time to appearance of UV-induced skin tumors as compared to vehicle control. Hairless (Skh-1) mice were exposed to UVA light for 3.5 hours five times every two weeks for up to 78 weeks while concurrently being administered ciprofloxacin. The time to development of the first skin tumors was 50 weeks in mice treated concomitantly with UVA and ciprofloxacin (mouse dose approximately equal to maximum recommended human dose based upon body surface area), as opposed to 34 weeks when animals were treated with both UVA and vehicle. The times to development of skin tumors ranged from 16 to32 weeks in mice treated concomitantly with UVA and other quinolones.⁹

In this model, mice treated with ciprofloxacin alone did not develop skin or systemic tumors. There are no data from similar models using pigmented mice and/or fully haired mice. The clinical significance of these findings to humans is unknown.

Fertility studies performed in rats at oral doses of ciprofloxacin up to 100 mg/kg (approximately 0.7-times the highest recommended therapeutic dose based upon body surface area) revealed no evidence of impairment.

Use In Specific Populations

Pregnancy

Pregnancy Category C

There are no adequate and well-controlled studies in pregnant women. CIPRO IV should not be used during pregnancy unless the potential benefit justifies the potential risk to both fetus and mother. An expert review of published data on experiences with ciprofloxacin use during pregnancy by TERIS–the Teratogen Information System–concluded that therapeutic doses during pregnancy are unlikely to pose a substantial teratogenic risk (quantity and quality of data=fair), but the data are insufficient to state that there is no risk.²

A controlled prospective observational study followed 200 women exposed to fluoroquinolones (52.5% exposed to ciprofloxacin and 68% first trimester exposures) during gestation.³ In utero exposure to fluoroquinolones during embryogenesis was not associated with increased risk of major malformations. The reported rates of major congenital malformations were 2.2% for the fluoroquinolone group and 2.6% for the control group (background incidence of major malformations is 1–5%). Rates of spontaneous abortions, prematurity and low birth weight did not differ between the groups and there were no clinically significant musculoskeletal dysfunctions up to one year of age in the ciprofloxacin exposed children.

Another prospective follow-up study reported on 549 pregnancies with fluoroquinolone exposure (93% first trimester exposures).⁴ There were 70 ciprofloxacin exposures, all within the first trimester. The malformation rates among live-born babies exposed to ciprofloxacin and to fluoroquinolones overall were both within background incidence ranges. No specific patterns of congenital abnormalities were found. The study did not reveal any clear adverse reactions due to in utero exposure to ciprofloxacin.

No differences in the rates of prematurity, spontaneous abortions, or birth weight were seen in women exposed to ciprofloxacin during pregnancy.^2,3 However, these small postmarketing epidemiology studies, of which most experience is from short term, first trimester exposure, are insufficient to evaluate the risk for less common defects or to permit reliable and definitive conclusions regarding the safety of ciprofloxacin in pregnant women and their developing fetuses.

Reproduction studies have been performed in rats and mice using oral doses up to 100 mg/kg (0.6 and 0.3 times the maximum daily human dose based upon body surface area, respectively) and have revealed no evidence of harm to the fetus due to ciprofloxacin. In rabbits, oral ciprofloxacin dose levels of 30 and 100 mg/kg (approximately 0.4-and 1.3-times the highest recommended therapeutic dose based upon body surface area) produced gastrointestinal toxicity resulting in maternal weight loss and an increased incidence of abortion, but no teratogenicity was observed at either dose level. After intravenous administration of doses up to 20 mg/kg (approximately 0.3-times the highest recommended therapeutic dose based upon body surface area), no maternal toxicity was produced and no embryotoxicity or teratogenicity was observed.

Nursing Mothers

Ciprofloxacin is excreted in human milk. The amount of ciprofloxacin absorbed by the nursing infant is unknown. Because of the potential risk of serious adverse reactions (including articular damage) in infants nursing from mothers taking CIPRO IV, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

Pediatric Use

Although effective in clinical trials, CIPRO IV is not a drug of first choice in the pediatric population due to an increased incidence of adverse reactions compared to controls. Quinolones, including CIPRO IV, cause arthropathy in juvenile animals [see WARNINGS AND PRECAUTIONS and Nonclinical Toxicology].

Complicated Urinary Tract Infection and Pyelonephritis

CIPRO IV is indicated for the treatment of cUTI and pyelonephritis due to Escherichia coli in pediatric patients 1 to 17 years of age. Although effective in clinical trials, CIPRO IV is not a drug of first choice in the pediatric population due to an increased incidence of adverse reactions compared to the controls, including events related to joints and/or surrounding tissues. [See ADVERSE REACTIONS and Clinical Studies]

Inhalational Anthrax (Post-Exposure)

CIPRO IV is indicated in pediatric patients from birth to 17 years of age for inhalational anthrax (postexposure). The risk-benefit assessment indicates that administration of ciprofloxacin to pediatric patients is appropriate [see DOSAGE AND ADMINISTRATION and Clinical Studies].

Plague

CIPRO IV is indicated in pediatric patients from birth to 17 years of age, for treatment of plague, including pneumonic and septicemic plague due to Yersinia pestis (Y. pestis) and prophylaxis for plague. Efficacy studies of CIPRO IV could not be conducted in humans with pneumonic plague for feasibility reasons. Therefore, approval of this indication was based on an efficacy study conducted in animals. The risk-benefit assessment indicates that administration of CIPRO to pediatric patients is appropriate. [See INDICATIONS AND USAGE, DOSAGE AND ADMINISTRATION, and Clinical Studies]

Geriatric Use

Geriatric patients are at increased risk for developing severe tendon disorders including tendon rupture when being treated with a fluoroquinolone such as CIPRO IV. This risk is further increased in patients receiving concomitant corticosteroid therapy. Tendinitis or tendon rupture can involve the Achilles, hand, shoulder, or other tendon sites and can occur during or after completion of therapy; cases occurring up to several months after fluoroquinolone treatment have been reported. Caution should be used when prescribing CIPRO IV to elderly patients especially those on corticosteroids. Patients should be informed of this potential adverse reaction and advised to discontinue CIPRO and contact their healthcare provider if any symptoms of tendinitis or tendon rupture occur. [See BOXED WARNING, WARNINGS AND PRECAUTIONS, and ADVERSE REACTIONS]

In a retrospective analysis of 23 multiple-dose controlled clinical trials of CIPRO encompassing over 3500 ciprofloxacin-treated patients, 25% of patients were greater than or equal to 65 years of age and 10% were greater than or equal to 75 years of age. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals on any drug therapy cannot be ruled out. Ciprofloxacin is known to be substantially excreted by the kidney, and the risk of adverse reactions may be greater in patients with impaired renal function. No alteration of dosage is necessary for patients greater than 65 years of age with normal renal function. However, since some older individuals experience reduced renal function by virtue of their advanced age, care should be taken in dose selection for elderly patients, and renal function monitoring may be useful in these patients. [See DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]

In general, elderly patients may be more susceptible to drug-associated effects on the QT interval. Therefore, precaution should be taken when using CIPRO IV with concomitant drugs that can result in prolongation of the QT interval (for example, class IA or class III antiarrhythmics) or in patients with risk factors for torsade de pointes (for example, known QT prolongation, uncorrected hypokalemia). [See WARNINGS AND PRECAUTIONS]

Renal Impairment

Ciprofloxacin is eliminated primarily by renal excretion; however, the drug is also metabolized and partially cleared through the biliary system of the liver and through the intestine. These alternative pathways of drug elimination appear to compensate for the reduced renal excretion in patients with renal impairment. Nonetheless, some modification of dosage is recommended, particularly for patients with severe renal dysfunction. [See DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]

Hepatic Impairment

In preliminary studies in patients with stable chronic liver cirrhosis, no significant changes in ciprofloxacin pharmacokinetics have been observed. The pharmacokinetics of ciprofloxacin in patients with acute hepatic insufficiency, have not been studied.

REFERENCES

2. Friedman J, Polifka J. Teratogenic effects of drugs: a resource for clinicians (TERIS). Baltimore, Maryland: Johns Hopkins University Press, 2000:149-195.

3. Loebstein R, Addis A, Ho E, et al. Pregnancy outcome following gestational exposure to fluoroquinolones: a multicenter prospective controlled study. Antimicrob Agents Chemother. 1998;42(6):1336-1339.

4. Schaefer C, Amoura-Elefant E, Vial T, et al. Pregnancy outcome after prenatal quinolone exposure. Evaluation of a case registry of the European network of teratology information services (ENTIS). Eur J Obstet Gynecol Reprod Biol. 1996;69:83-89.

In the event of acute overdosage, reversible renal toxicity has been reported in some cases. Observe the patient carefully and give supportive treatment, including monitoring of renal function, urinary pH and acidify, if required, to prevent crystalluria. Adequate hydration must be maintained. Only a small amount of ciprofloxacin (less than 10%) is removed from the body after hemodialysis or peritoneal dialysis.

In mice, rats, rabbits and dogs, significant toxicity including tonic/clonic convulsions was observed at intravenous doses of ciprofloxacin between 125mg/kg and 300 mg/kg.

Contraindications

Hypersensitivity

Ciprofloxacin is contraindicated in persons with a history of hypersensitivity to ciprofloxacin, any member of the quinolone class of antibacterials, or any of the product components [see WARNINGS AND PRECAUTIONS].

Tizanidine

Concomitant administration with tizanidine is contraindicated [see DRUG INTERACTIONS].

Mechanism Of Action

Ciprofloxacin is a member of the fluoroquinolone class of antibacterial agents [see Microbiology].

Pharmacokinetics

Absorption

Following 60-minute intravenous infusions of 200 mg and 400 mg CIPRO IV to normal volunteers, the mean maximum serum concentrations achieved were 2.1 and 4.6 mcg/mL, respectively; the concentrations at 12 hours were 0.1 and 0.2 mcg/mL, respectively (Table 9).

Table 9: Steady-state Ciprofloxacin Serum Concentrations (mcg/mL) After 60-minute INTRAVENOUS Infusions every 12 hours.

Time after starting the infusion
Dose	30 minutes	1 hour	3 hour	6 hour	8 hour	12 hour
200 mg	1.7	2.1	0.6	0.3	0.2	0.1
400 mg	3.7	4.6	1.3	0.7	0.5	0.2

The pharmacokinetics of ciprofloxacin are linear over the dose range of 200 mg to 400 mg administered intravenously. Comparison of the pharmacokinetic parameters following the 1st and 5th intravenous dose on an every 12 hour regimen indicates no evidence of drug accumulation.

The absolute bioavailability of oral ciprofloxacin is within a range of 70–80% with no substantial loss by first pass metabolism. An intravenous infusion of 400-mg ciprofloxacin given over 60 minutes every 12 hours has been shown to produce an area under the serum concentration time curve (AUC) equivalent to that produced by a 500-mg oral dose given every 12 hours. An intravenous infusion of 400 mg ciprofloxacin given over 60 minutes every 8 hours has been shown to produce an AUC at steady-state equivalent to that produced by a 750-mg oral dose given every 12 hours. A 400-mg intravenous dose results in a C max similar to that observed with a 750-mg oral dose. An infusion of 200 mg CIPRO given every 12 hours produces an AUC equivalent to that produced by a 250-mg oral dose given every 12 hours (Table 10).

Table 10: Steady-state Pharmacokinetic Parameters Following Multiple Oral and Intravenous Doses

Parameters	500 mg	400 mg	750 mg	400 mg
	every 12 hours Orally.	every 12 hours, intravenously	every 12 hours, orally	every 8 hours,
AUC (mcg•hr/mL)	13.71	12.71	31.62	32.93
Cmax (mcg/mL)	2.97	4.56	3.59	4.07
1AUC 0-12h 2AUC 24h = AUC 0-12h x 2 3AUC 24h = AUC 0-8h x 3

Distribution

After intravenous administration, ciprofloxacin is widely distributed throughout the body. Tissue concentrations often exceed serum concentrations in both men and women, particularly in genital tissue including the prostate. Ciprofloxacin is present in active form in the saliva, nasal and bronchial secretions, mucosa of the sinuses, sputum, skin blister fluid, lymph, peritoneal fluid, bile, and prostatic secretions. Ciprofloxacin has also been detected in lung, skin, fat, muscle, cartilage, and bone. The drug diffuses into the cerebrospinal fluid (CSF); however, CSF concentrations are generally less than 10% of peak serum concentrations. Low levels of the drug have been detected in the aqueous and vitreous humors of the eye.

Metabolism

After intravenous administration, three metabolites of ciprofloxacin have been identified in human urine which together account for approximately 10% of the intravenous dose. The metabolites have antimicrobial activity, but are less active than unchanged. Ciprofloxacin is an inhibitor of human cytochrome P450 1A2 (CYP1A2) mediated metabolism. Co-administration of ciprofloxacin with other drugs primarily metabolized by CYP1A2 results in increased plasma concentrations of these drugs and could lead to clinically significant adverse events of the co-administered drug [see CONTRAINDICATIONS, WARNINGS AND PRECAUTIONS, DRUG INTERACTIONS].

Excretion

The serum elimination half-life is approximately 5–6 hours and the total clearance is around 35 L/hr. After intravenous administration, approximately 50% to 70% of the dose is excreted in the urine as unchanged drug. Following a 200-mg intravenous dose, concentrations in the urine usually exceed 200 mcg/mL 0–2 hours after dosing and are generally greater than 15 mcg/mL 8–12 hours after dosing. Following a 400 mg intravenous dose, urine concentrations generally exceed 400 mcg/mL 0–2 hours after dosing and are usually greater than 30 mcg/mL 8–12 hours after dosing. The renal clearance is approximately 22 L/hr. The urinary excretion of ciprofloxacin is virtually complete by 24 hours after dosing.

Although bile concentrations of ciprofloxacin are several fold higher than serum concentrations after intravenous dosing, only a small amount of the administered dose ( < less than1%) is recovered from the bile as unchanged drug. Approximately 15% of an intravenous dose is recovered from the feces within 5 days after dosing.

Specific Populations

Elderly

Pharmacokinetic studies of the oral (single dose) and intravenous (single and multiple dose) forms of ciprofloxacin indicate that plasma concentrations of ciprofloxacin are higher in elderly subjects (older than 65 years) as compared to young adults. Although the Cmax is increased 16% to40%, the increase in mean AUC is approximately 30%, and can be at least partially attributed to decreased renal clearance in the elderly. Elimination half-life is only slightly (~20%) prolonged in the elderly. These differences are not considered clinically significant. [See Use In Specific Populations]

Renal Impairment

In patients with reduced renal function, the half-life of ciprofloxacin is slightly prolonged. Dosage adjustments may be required [see Use in Specific Populations, DOSAGE AND ADMINISTRATION].

Hepatic Impairment

In preliminary studies in patients with stable chronic liver cirrhosis, no significant changes in ciprofloxacin pharmacokinetics have been observed. The kinetics of ciprofloxacin in patients with acute hepatic insufficiency, have not been fully studied.

Pediatrics

Following a single oral dose of 10 mg/kg CIPRO suspension to 16 children ranging in age from 4 months to 7 years, the mean C max was 2.4 mcg/mL (range: 1.5 to 3.4 mcg/mL) and the mean AUC was 9.2 mcg*hr/mL (range: 5.8 mcg*hr/mL to 14.9 mcg*hr/mL). There was no apparent age-dependence, and no notable increase in C max or AUC upon multiple dosing (10 mg/kg three times a day). In children with severe sepsis who were given intravenous ciprofloxacin (10 mg/kg as a 1-hour infusion), the mean C max was 6.1 mcg/mL (range: 4.6 mcg/mL to 8.3 mcg/mL) in 10 children less than 1 year of age; and 7.2 mcg/mL (range: 4.7 mcg/mL to 11.8 mcg/mL) in 10 children between 1 year and 5 years of age. The AUC values were 17.4 mcg*hr/mL (range: 11.8 mcg*hr/mL to 32.0 mcg*hr/mL) and 16.5 mcg*hr/mL (range: 11 mcg*hr/mL to 23.8 mcg*hr/mL) in the respective age groups. These values are within the range reported for adults at therapeutic doses. Based on population pharmacokinetic analysis of pediatric patients with various infections, the predicted mean half-life in children is approximately 4 hours–5 hours, and the bioavailability of the oral suspension is approximately 60%.

Drug-Drug Interactions

Metronidazole

The serum concentrations of ciprofloxacin and metronidazole were not altered when these two drugs were given concomitantly.

Tizanidine

In a pharmacokinetic study, systemic exposure of tizanidine (4 mg single dose) was significantly increased (C max 7-fold, AUC 10-fold) when the drug was given concomitantly with CIPRO (500 mg twice a day for 3 days). Concomitant administration of tizanidine and CIPRO IV is contraindicated due to the potentiation of hypotensive and sedative effects of tizanidine [see CONTRAINDICATIONS].

Ropinirole

In a study conducted in 12 patients with Parkinson’s disease who were administered 6 mg ropinirole once daily with 500 mg CIPRO twice-daily, the mean C max and mean AUC of ropinirole were increased by 60% and 84%, respectively. Monitoring for ropinirole-related adverse reactions and appropriate dose adjustment of ropinirole is recommended during and shortly after co-administration with CIPRO IV [see WARNINGS AND PRECAUTIONS].

Clozapine

Following concomitant administration of 250 mg CIPRO with 304 mg clozapine for 7 days, serum concentrations of clozapine and N-desmethylclozapine were increased by 29% and 31%, respectively. Careful monitoring of clozapine associated adverse reactions and appropriate adjustment of clozapine dosage during and shortly after co-administration with CIPRO IV are advised.

Sildenafil

Following concomitant administration of a single oral dose of 50 mg sildenafil with 500 mg CIPRO to healthy subjects, the mean C max and mean AUC of sildenafil were both increased approximately two-fold. Use sildenafil with caution when co-administered with CIPRO due to the expected two-fold increase in the exposure of sildenafil upon co-administration of CIPRO IV.

Duloxetine

In clinical studies it was demonstrated that concomitant use of duloxetine with strong inhibitors of the CYP450 1A2 isozyme such as fluvoxamine, may result in a 5-fold increase in mean AUC and a 2.5-fold increase in mean C max of duloxetine.

Lidocaine

In a study conducted in 9 healthy volunteers, concomitant use of 1.5 mg/kg IV lidocaine with 500 mg ciprofloxacin twice daily resulted in an increase of lidocaine C max and AUC by 12% and 26%, respectively. Although lidocaine treatment was well tolerated at this elevated exposure, a possible interaction with CIPRO IV and an increase in adverse reactions related to lidocaine may occur upon concomitant administration.

Microbiology

Mechanism of Action

The bactericidal action of ciprofloxacin results from inhibition of the enzymes topoisomerase II (DNA gyrase) and topoisomerase IV (both Type II topoisomerases), which are required for bacterial DNA replication, transcription, repair, and recombination.

Mechanism of Resistance

The mechanism of action of fluoroquinolones, including ciprofloxacin, is different from that of penicillins, cephalosporins, aminoglycosides, macrolides, and tetracyclines; therefore, microorganisms resistant to these classes of drugs may be susceptible to ciprofloxacin. Resistance to fluoroquinolones occurs primarily by either mutations in the DNA gyrases, decreased outer membrane permeability, or drug efflux. In vitro resistance to ciprofloxacin develops slowly by multiple step mutations. Resistance to ciprofloxacin due to spontaneous mutations occurs at a general frequency of between < 10^-9 to 1×10^-6 .

Cross Resistance

There is no known cross-resistance between ciprofloxacin and other classes of antimicrobials.

Ciprofloxacin has been shown to be active against most isolates of the following bacteria, both in vitro and in clinical infections [see INDICATIONS AND USAGE].

Gram-positive Bacteria

Bacillus anthracis
Enterococcus faecalis
Staphylococcus aureus (methicillin-susceptible isolates only)
Staphylococcus epidermidis (methicillin-susceptible isolates only)
Staphylococcus saprophyticus
Streptococcus pneumoniae
Streptococcus pyogenes

Gram-negative Bacteria

Citrobacter koseri
Citrobacter freundii
Enterobacter cloacae
Escherichia coli
Haemophilus influenzae
Haemophilus parainfluenzae
Klebsiella pneumoniae
Moraxella catarrhalis
Morganella morganii
Proteus mirabilis
Proteus vulgaris
Providencia rettgeri
Providencia stuartii
Pseudomonas aeruginosa
Serratia marcescens
Yersinia pestis

The following in vitro data are available, but their clinical significance is unknown. At least 90 percent of the following bacteria exhibit an in vitro minimum inhibitory concentration (MIC) less than or equal to the susceptible breakpoint for ciprofloxacin ( ≤ 1 mcg/mL). However, the efficacy of ciprofloxacin in treating clinical infections due to these bacteria has not been established in adequate and well-controlled clinical trials.

Gram-positive Bacteria

Staphylococcus haemolyticus (methicillin-susceptible isolates only)
Staphylococcus hominis (methicillin-susceptible isolates only)

Gram-negative Bacteria

Acinetobacter lwoffi
Aeromonas hydrophila
Edwardsiella tarda
Enterobacter aerogenes
Klebsiella oxytoca
Legionella pneumophila
Pasteurella multocida

Susceptibility Test Methods

When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial drug products used in resident hospitals to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting an antibacterial drug product for treatment.

Dilution Techniques

Quantitative methods are used to determine antimicrobial minimum inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized test method (broth and/or agar).^5,6,7 The MIC values should be interpreted according to criteria provided in Table 10.

Diffusion Techniques

Quantitative methods that require measurement of zone diameters can also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. The zone size provides an estimate of the susceptibility of bacteria to antimicrobial compounds. The zone size should be determined using a standardized test method.^6,7,8 This procedure uses paper disks impregnated with 5 mcg ciprofloxacin to test the susceptibility of bacteria to ciprofloxacin. The disc diffusion interpretive criteria are provided in Table 11.

Table 11: Susceptibility Test Interpretive Criteria for Ciprofloxacin

Bacteria	MIC	(mcg/mL)		Zone Diameter (mm)
	S	I	R	S	I	R
Enterobacteriaceae	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Enterococcus faecalis	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Staphylococcus aureus	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Staphylococcus epidermidis	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Staphylococcus saprophyticus	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Pseudomonas aeruginosa	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Haemophilus influenzae1	≤ 1	–	–	≥ 21	–	–
Haemophilus parainfluenzae1	≤ 1	–	–	≥ 21	–	–
Streptococcus pneumoniae	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Streptococcus pyogenes	≤ 1	2	≥ 4	≥ 21	16-20	≤ 15
Bacillus anthracis1	≤ 0.25	–	–	–	–	–
Yersinia pestis1	≤ 0.25	–	–	–	–	–
S=Susceptible, I=Intermediate, and R=Resistant. 1The current absence of data on resistant isolates precludes defining any results other than “Susceptible”. If isolates yield MIC results other than susceptible, they should be submitted to a reference laboratory for further testing.

A report of “Susceptible” indicates that the antimicrobial is likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentrations at the site of infection necessary to inhibit growth of the pathogen. A report of “Intermediate” indicates that the result should be considered equivocal, and, if the microorganism is not fully susceptible to alternative, clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated or in situations where high dosage of drug can be used. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of “Resistant” indicates that the antimicrobial is not likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentrations usually achievable at the infection site; other therapy should be selected.

Quality Control

Standardized susceptibility test procedures require the use of laboratory controls to monitor the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individuals performing the test.^5,6,7,8 Standard ciprofloxacin powder should provide the following range of MIC values noted in Table 12. For the diffusion technique using the ciprofloxacin 5 mcg disk the criteria in Table 12 should be achieved.

Table 12: Acceptable Quality Control Ranges for Ciprofloxacin

Bacteria	MIC range (mcg/mL)	Zone Diameter (mm)
Enterococcus faecalis ATCC 29212	0.25-2	–
Escherichia coli ATCC 25922	0.004-0.015	30-40
Haemophilus influenzae ATCC 49247	0.004-0.03	34-42
Pseudomonas aeruginosa ATCC 27853	0.25-1	25-33
Staphylococcus aureus ATCC 29213	0.12-0.5	–
Staphylococcus aureus ATCC 25923	–	22-30

Animal Toxicology And/Or Pharmacology

Ciprofloxacin and other quinolones have been shown to cause arthropathy in immature animals of most species tested [see WARNINGS AND PRECAUTIONS].

Damage of weight-bearing joints was observed in juvenile dogs and rats. In young beagles, 100 mg/kg ciprofloxacin, given daily for 4 weeks, caused degenerative articular changes of the knee joint. At 30 mg/kg, the effect on the joint was minimal. In a subsequent study in young beagle dogs, oral ciprofloxacin doses of 30 mg/kg and 90 mg/kg ciprofloxacin (approximately 1.3-times and 3.5-times the pediatric dose based upon comparative plasma AUCs) given daily for 2 weeks caused articular changes which were still observed by histopathology after a treatment-free period of 5 months. At 10 mg/kg (approximately 0.6-times the pediatric dose based upon comparative plasma AUCs), no effects on joints were observed. This dose was also not associated with arthrotoxicity after an additional treatment-free period of 5 months. In another study, removal of weight bearing from the joint reduced the lesions but did not totally prevent them.

Crystalluria, sometimes associated with secondary nephropathy, occurs in laboratory animals dosed with ciprofloxacin. This is primarily related to the reduced solubility of ciprofloxacin under alkaline conditions, which predominate in the urine of test animals; in man, crystalluria is rare since human urine is typically acidic. In rhesus monkeys, crystalluria without nephropathy was noted after single oral doses as low as 5 mg/kg (approximately 0.07-times the highest recommended therapeutic dose based upon body surface area). After 6 months of intravenous dosing at 10 mg/kg/day, no nephropathological changes were noted; however, nephropathy was observed after dosing at 20 mg/kg/day for the same duration (approximately 0.2-times the highest recommended therapeutic dose based upon body surface area).

In dogs, ciprofloxacin at 3 mg/kg and 10 mg/kg by rapid intravenous injection (15 sec.) produces pronounced hypotensive effects. These effects are considered to be related to histamine release, since they are partially antagonized by pyrilamine, an antihistamine. In rhesus monkeys, rapid intravenous injection also produces hypotension but the effect in this species is inconsistent and less pronounced.

In mice, concomitant administration of nonsteroidal anti-inflammatory drugs such as phenylbutazone and indomethacin with quinolones has been reported to enhance the CNS stimulatory effect of quinolones.

Ocular toxicity seen with some related drugs has not been observed in ciprofloxacin-treated animals

Clinical Studies

Empirical Therapy In Adult Febrile Neutropenic Patients

The safety and efficacy of CIPRO IV, 400 mg intravenously every 8 hours, in combination with piperacillin sodium, 50 mg/kg intravenously every 4 hours, for the empirical therapy of febrile neutropenic patients were studied in one large pivotal multicenter, randomized trial and were compared to those of tobramycin, 2 mg/kg intravenously every 8 hours, in combination with piperacillin sodium, 50 mg/kg intravenously every 4 hours.

Clinical response rates observed in this study were as follows:

The clinical success and bacteriologic eradication rates in the Per Protocol population were similar between ciprofloxacin and the comparator group as shown in Table 13.

Table 13: Clinical Response Rates

Outcomes	CIPRO IV/Piperacillin N = 233 Success (%)	Tobramycin/ Piperacillin N = 237 Success (%)
Clinical Resolution of Initial Febrile Episode with No	63 (27%)	52 (21.9%)
Modifications of Empirical Regimen1
Clinical Resolution of Initial Febrile Episode Including Patients with Modifications of Empirical Regimen	187 (80.3%)	185 (78.1%)
Overall Survival	224 (96.1%)	185 (78.1%)
1 To be evaluated as a clinical resolution, patients had to have: (1) resolution of fever; (2) microbiological eradication of infection (if an infection was microbiologically documented); (3) resolution of signs/symptoms of infection; and (4) no modification of empirical antibiotic regimen

 

Complicated Urinary Tract Infection And Pyelonephritis–Efficacy In Pediatric Patients

Ciprofloxacin, administered IV and/or orally, was compared to a cephalosporin for treatment of complicated urinary tract infections (cUTI) and pyelonephritis in pediatric patients 1 to 17 years of age (mean age of 6 ± 4 years). The trial was conducted in the US, Canada, Argentina, Peru, Costa Rica, Mexico, South Africa, and Germany. The duration of therapy was 10 to 21 days (mean duration of treatment was 11 days with a range of 1 to 88 days). The primary objective of the study was to assess musculoskeletal and neurological safety.

Patients were evaluated for clinical success and bacteriological eradication of the baseline organism(s) with no new infection or superinfection at 5 to 9 days post-therapy (Test of Cure or TOC). The Per Protocol population had a causative organism(s) with protocol specified colony count(s) at baseline, no protocol violation, and no premature discontinuation or loss to follow-up (among other criteria).

The clinical success and bacteriologic eradication rates in the Per Protocol population were similar between ciprofloxacin and the comparator group as shown in Table 14.

Table 14: Clinical Success and Bacteriologic Eradication at Test of Cure (5 to 9 Days Post-Therapy)

	CIPRO	Comparator
Randomized Patients	337	352
Per Protocol Patients	211	231
Clinical Response at 5 to 9 Days PostTreatment	95.7% (202/211)	92.6% (214/231)
	95% CI [-1.3%, 7.3%]
Bacteriologic Eradication by Patient at 5 to 9 Days Post-Treatment1	84.4% (178/211)	78.3% (181/231)
	95% CI [-1.3%, 13.1%]
Bacteriologic Eradication of the Baseline Pathogen at 5 to 9 Days PostTreatment
Escherichia coli	156/178 (88%)	161/179 (90%)
1 Patients with baseline pathogen(s) eradicated and no new infections or superinfections/total number of patients. There were 5.5% (6/211) ciprofloxacin and 9.5% (22/231) comparator patients with superinfections or new infections.

Inhalational Anthrax In Adults And Pediatrics

Additional information

The mean serum concentrations of ciprofloxacin associated with a statistically significant improvement in survival in the rhesus monkey model of inhalational anthrax are reached or exceeded in adult and pediatric patients receiving oral and intravenous regimens. Ciprofloxacin pharmacokinetics have been evaluated in various human populations. The mean peak serum concentration achieved at steady-state in human adults receiving 500 mg orally every 12 hours is 2.97 mcg/mL, and 4.56 mcg/mL following 400 mg intravenously every 12 hours. The mean trough serum concentration at steady-state for both of these regimens is 0.2 mcg/mL. In a study of 10 pediatric patients between 6 and 16 years of age, the mean peak plasma concentration achieved is 8.3 mcg/mL and trough concentrations range from 0.09 mcg/mL to 0.26 mcg/mL, following two 30-minute intravenous infusions of 10 mg/kg administered 12 hours apart. After the second intravenous infusion patients switched to 15 mg/kg orally every 12 hours achieve a mean peak concentration of 3.6 mcg/mL after the initial oral dose. Long-term safety data, including effects on cartilage, following the administration of ciprofloxacin to pediatric patients are limited. Ciprofloxacin serum concentrations achieved in humans serve as a surrogate endpoint reasonably likely to predict clinical benefit and provide the basis for this indication.¹¹

A placebo-controlled animal study in rhesus monkeys exposed to an inhaled mean dose of 11 LD50 (~5.5 x 10⁵) spores (range 5-30 LD 50) of B. anthracis was conducted. The minimal inhibitory concentration (MIC) of ciprofloxacin for the anthrax strain used in this study was 0.08 mcg/mL. In the animals studied, mean serum concentrations of ciprofloxacin achieved at expected T max (1 hour post-dose) following oral dosing to steady-state ranged from 0.98 mcg/mL to 1.69 mcg/mL. Mean steady-state trough concentrations at 12 hours post-dose ranged from 0.12 mcg/mL to 0.19 mcg/mL.¹⁰ Mortality due to anthrax for animals that received a 30-day regimen of oral ciprofloxacin beginning 24 hours post-exposure was significantly lower (1/9), compared to the placebo group (9/10) [p= 0.001]. The one ciprofloxacin-treated animal that died of anthrax did so following the 30-day drug administration period.¹¹

More than 9300 persons were recommended to complete a minimum of 60 days of antibacterial prophylaxis against possible inhalational exposure to B. anthracis during 2001. Ciprofloxacin was recommended to most of those individuals for all or part of the prophylaxis regimen. Some persons were also given anthrax vaccine or were switched to alternative antibacterial drugs. No one who received ciprofloxacin or other therapies as prophylactic treatment subsequently developed inhalational anthrax. The number of persons who received ciprofloxacin as all or part of their post-exposure prophylaxis regimen is unknown.

Plague

A placebo-controlled animal study in African green monkeys exposed to an inhaled mean dose of 110 LD50 (range 92 to 127 LD50) of Yersinia pestis (CO92 strain) was conducted. The minimal inhibitory concentration (MIC) of ciprofloxacin for the Y. pestis strain used in this study was 0.015 mcg/mL. Mean peak serum concentrations of ciprofloxacin achieved at the end of a single 60 minute infusion were 3.49 mcg/mL ± 0.55 mcg/mL, 3.91 mcg/mL ± 0.58 mcg/mL and 4.03 mcg/mL ± 1.22 mcg/mL on Day 2, Day 6 and Day 10 of treatment in African green monkeys, respectively All trough concentrations (Day 2, Day 6 and Day 10) were < 0.5 mcg/mL. Animals were randomized to receive either a 10-day regimen of intravenous ciprofloxacin 15 mg/kg, or placebo beginning when animals were found to be febrile (a body temperature greater than 1.5^oC over baseline for two hours), or at 76 hours post-challenge, whichever occurred sooner. Mortality in the ciprofloxacin group was significantly lower (1/10) compared to the placebo group (2/2) [difference: -90.0%, 95% exact confidence interval: -99.8% to -5.8%]. The one ciprofloxacin-treated animal that died did not receive the proposed dose of ciprofloxacin due to a failure of the administration catheter. Circulating ciprofloxacin concentration was below 0.5 mcg/mL at all timepoints tested in this animal. It became culture negative on Day 2 of treatment, but had a resurgence of low grade bacteremia on Day 6 after treatment initiation. Terminal blood culture in this animal was negative.¹²

REFERENCES

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10. Kelly DJ, et al. Serum concentrations of penicillin, doxycycline, and ciprofloxacin during prolonged therapy in rhesus monkeys. J Infect Dis 1992; 166:1184-7.

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12. Anti-infective Drugs Advisory Committee Meeting, April 3, 2012 -The efficacy of Ciprofloxacin for treatment of Pneumonic Plague.