Oxilan

Patient Information

Patients receiving iodinated intravascular contrast agents should be instructed to:

1. Inform your physician if you are pregnant. (See PRECAUTIONS – Pregnancy.)
2. Inform your physician if you are diabetic or if you have multiple myeloma, pheochromocytoma, homozygous sickle cell disease, or known thyroid disorder. (See WARNINGS.)
3. Inform your physician if you are allergic to any drugs, or food, or if you have immune, autoimmune or immune deficiency disorders. Also inform your physician if you had any reactions to previous injections of dyes used for x-ray procedures. (See PRECAUTIONS, General.)
4. Inform your physician about all medications you are currently taking, including non-prescription drugs (over-thecounter) drugs, before you have this procedure.
5. Advise patients to inform their physician if they develop a rash after receiving Oxilan.

Description

OXILAN® (Ioxilan Injection) formulations are stable, aqueous, sterile, and non-pyrogenic solutions for intravascular administration as diagnostic radiopaque media. Ioxilan is designated chemically as N-(2,3-dihydroxypropyl)-N’-(2hydroxyethyl)-5-[N-(2,3-dihydroxypropyl) acetamido]-2,4,6-triiodoisophthal-amide and has the following structural formula:

 

 

The molecular weight of ioxilan is 791.12 and the organically bound iodine content is 48.1%. Ioxilan is nonionic and does not dissociate in solution. OXILAN® (Ioxilan Injection) Pharmacy Bulk Package is available in two strengths: OXILAN® (Ioxilan Injection) 300 mgI/mL and OXILAN® (Ioxilan Injection) 350 mgI/mL.

Each mL of OXILAN® (Ioxilan Injection) 300 mgI/mL provides 623 mg ioxilan. Each mL of OXILAN® (Ioxilan Injection) 350 mgI/mL provides 727 mg ioxilan. Each mL of OXILAN® (Ioxilan Injection) 300 mgI/mL Pharmacy Bulk Package provides 623 mg ioxilan.

Each mL of OXILAN® (Ioxilan Injection) 350 mgI/mL Pharmacy Bulk Package provides 727 mg ioxilan. Each mL of OXILAN® solution contains 0.1 mg edetate calcium disodium (anhydrous basis), 1.0 mg tromethamine, 0.5 mg sodium chloride and a minimum of 0.2 mg (0.01 mEq) sodium. The pH is adjusted to 6.8 (5.5 to 7.5) with hydrochloric acid and sodium hydroxide. The solutions contain no preservative. Pertinent physicochemical data are below. OXILAN® (Ioxilan Injection) is hypertonic compared to plasma (approximately 285 mOsm/kg water).

 

Concentration (mgI/mL)	Concentration W/V
	300	350
Measured Osmolality (mOsm/kg water) @ 37°C	610	721
Viscosity (cPs)@ 37°C	5.1	8.1
@ 20°C	9.4	16.3
Specific Gravity@ 37°C	1.319	1.373
@ 20°C	1.327	1.382

 

The OXILAN® formulations are clear, colorless to pale yellow solutions containing no undissolved solids. Crystallization does not occur at room temperature. OXILAN® solutions have osmolalities of 2.1 and 2.5 times that of plasma (285 mOsm/kg water) and are hypertonic under conditions of use.

Each bottle of OXILAN® Pharmacy Bulk Package is to be used for dispensing multiple single dose preparations utilizing a suitable transfer device.

Indications

Intraarterial

OXILAN® Injection (300 mgI/mL) is indicated for cerebral arteriography. OXILAN® Injection (350 mgI/mL) is indicated for coronary arteriography and left ventriculography, visceral angiography, aortography, and peripheral arteriography.

Intravenous

OXILAN® Injection (300 mgI/mL) and OXILAN® Injection (350 mgI/mL) are indicated for excretory urography and contrast enhanced computed tomographic (CECT) imaging of the head and body.

Dosage And Administration

Adult Dosage And Administration

General

The combination of volume and OXILAN® concentration to be used should be carefully individualized accounting for factors such as age, body weight, size of the vessel and the rate of blood flow within the vessel. Specific dose adjustments for age, gender, weight, and renal function have not been studied for OXILAN®. As with all iodinated contrast agents, lower doses of OXILAN® Injection may have less risk. The efficacy of OXILAN® Injection below doses recommended has not been studied. Other factors such as anticipated pathology, degree and extent of opacification required, structure(s) or area to be examined, disease processes affecting the patient, and equipment and technique to be employed should also be considered.

The maximum recommended total dose of iodine is 86 grams.

If during administration a reaction occurs, the injection should be immediately stopped.

Patients should be adequately hydrated prior to and following intravascular administration of OXILAN® Injection. (See WARNINGS and PRECAUTIONS.)

Intraarterial Procedures

Coronary Arteriography and Left Ventriculography

OXILAN® Injection (350 mgI/mL) is indicated for intraarterial injection in the radiographic contrast evaluation of coronary arteries and the left ventricle. Injection rates should be approximately equal to flow rate in the vessel being injected.

The usual individual injection volumes for visualization of the coronary arteries and the left ventricle are as follows:

Left and Right Coronary:

2 mL to 10 mL (0.7 to 3.5 gI) of OXILAN® Injection -350 (350 mgI/mL)

Left Ventricle:

25 mL to 50 mL (8.75 to 17.5 gI) of OXILAN® Injection -350 (350 mgI/mL)

Total dose for the procedure should not usually exceed 250 mL.

When large individual volumes are administered, as in ventriculography and aortography, it is recommended that sufficient time be permitted to elapse between each injection to allow for subsidence of possible hemodynamic disturbances.

Mandatory prerequisites to the procedure are specialized personnel, ECG monitoring apparatus and adequate facilities for immediate resuscitation and cardioversion. Electrocardiograms and vital signs should be routinely monitored throughout the procedure.

Aortography And Selective Visceral Arteriography

OXILAN® Injection (350 mgI/mL) is indicated for intraarterial injection in the radiographic contrast evaluation of the aorta and major visceral arterial branches. The volume and rate of contrast injection should be proportional to the blood flow through the vessels of interest, and related to the vascular and pathological characteristics of the specific vessels being studied.

Total dose for the procedure should not usually exceed 250 mL.

Peripheral Arteriography

OXILAN® Injection (350 mgI/mL) is indicated for intraarterial injection in the radiographic contrast evaluation of peripheral arteries. Injection rates should be approximately equal to flow rate in the vessel being injected. The usual individual injection volumes for visualization of various peripheral arteries are as follows:

Aortic bifurcation for distal runoff:

45 mL to 100 mL (26 to 70 gI) of OXILAN® Injection -350 (350 mgI/mL)

Subclavian or femoral artery:

10 mL to 40 mL (4 to 14 gI) of OXILAN® Injection -350 (350 mgI/mL)

Total dose for the procedure should not usually exceed 250 mL. Pulsation should be present in the artery to be injected.

Cerebral Arteriography

OXILAN® Injection (300 mgI/mL) is indicated for intraarterial injection in the radiographic contrast evaluation of arterial lesions of the brain. The usual individual volumes per injection are 8 mL to 12 mL (2.4 to 3.6 gI) of OXILAN® Injection -300 (300 mgI/mL).

Total dose for the procedure should not usually exceed 150 mL.

Intravenous Procedures

Intravenous Excretory Urography

OXILAN® Injection (300 mgI/mL or 350 mgI/mL) is indicated for intravenous injection for routine excretory urography. A volume of contrast which gives a dose of approximately 250 to 390 mgI/kg of body weight is recommended as suitable for adults with normal renal function.

Total dose for the procedure should not usually exceed 100 mL.

Contrast Enhanced Computed Tomography

OXILAN® Injection (300 mgI/mL or 350 mgI/mL) is indicated for intravenous injection for contrast-enhancement in the evaluation of neoplastic and non-neoplastic lesions of the head and body (intrathoracic, intraabdominal, and retroperitoneal regions).

CECT of the Head: The usual dose is 100 mL to 200 mL (30 to 60 gI) of OXILAN® Injection (300 mgI/mL) or 86 mL to 172 mL of OXILAN® Injection (350 mgI/mL). Scanning may be performed immediately after completion of the intravenous administration.

Total dose for the procedure should not usually exceed 200 mL. CECT of the Body:

OXILAN® Injection (300 mgI/mL or 350 mgI/mL) may be administered intravenously by bolus, by rapid infusion, or by a combination of both. The usual dose is 50 mL to 200 mL (15 to 60 gI) of OXILAN® (300 mgI/mL) or 43 mL to 172 mL of OXILAN® (350 mgI/mL).

Total dose for the procedure should not usually exceed 200 mL.

Drug Handling

As with all contrast media, because of the potential for chemical incompatibility, OXILAN® Injection should not be mixed with, or injected in, intravenous administration lines containing other drugs, solutions, or total nutritional admixtures.

Sterile technique must be used in all vascular injections involving contrast media.

It is desirable that intravascularly administered iodinated contrast agents be at or close to body temperature when injected.

If non-disposable equipment is used, scrupulous care should be taken to prevent residual contamination with traces of cleaning agents.

Withdrawal of contrast agents from their containers should be accomplished under aseptic conditions using only sterile syringes and transfer devices. Contrast agents which have been transferred into other delivery systems should be used immediately.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Ioxilan solutions should be used only if clear and within the normal colorless to pale yellow range.

OXILAN® formulations are supplied in single dose containers. Discard unused portion.

Direction for Proper Use of OXILAN®, Pharmacy Bulk Package

1. The transfer of OXILAN® (ioxilan Injection) from the Pharmacy Bulk Package is restricted to a suitable work area, such as a laminar flow hood.
2. The container closure may be penetrated only one time, utilizing a suitable transfer device and aseptic technique.
3. The withdrawal of container contents should be accomplished without delay. However, should this not be possible, a maximum time of [4] hours from initial closure entry is permitted to complete fluid transfer operations. The container should not be removed from the aseptic area during the entire 4 hour period.
4. The temperature of the container should not exceed 30°C, after the closure has been entered.

How Supplied

OXILAN® (Ioxilan Injection) 300 mgI/mL

Ten 50 mL single dose bottles, NDC 67684-1000-1
Ten 100 mL single dose bottles, NDC 67684-1000-2
Ten 150 mL single dose bottles, NDC 67684-1000-3

OXILAN® (Ioxilan Injection) 350 mgI/mL

Ten 50 mL single dose bottles, NDC 67684-1001-1
Ten 100 mL single dose bottles, NDC 67684-1001-2
Ten 150 mL single dose bottles, NDC 67684-1001-3
Ten 200 mL single dose bottles, NDC 67684-1001-4
OXILAN® (Ioxilan Injection) 300 mgI/mL Pharmacy Bulk Package -Six 500 mL bottles, NDC 67684-1000-5
OXILAN® (Ioxilan Injection) 350 mgI/mL Pharmacy Bulk Package -Six 500 mL bottles, NDC 67684-1001-5

Storage

Store at room temperature between 15° and 30°C (59° and 86°F) and protect from light. Do not freeze.

Guerbet LLC -Princeton, NJ 08540. Distributed by Guerbet LLC 821 Alexander Road, Suite 204, Princeton, NJ 08540. Revised Mar 2017

For demographics, see Clinical Trials section.

The following table of incidence of reactions is based upon controlled clinical studies in which OXILAN® was compared with a nonionic contrast agent (iohexol) in 531 patients. It includes all reported adverse events, regardless of attribution.

Adverse reactions are listed by body system and in decreasing order of occurrence greater than 0.5% in the OXILAN® group.

 

Body System	Adverse Event	Ioxilan (n=531)	Comparator (n=542)
Body as a Whole	Headache	19 (3.6%)	15 (2.8%)
	Fever	9 (1.7%)	11 (2.0%)
	Hematoma at Injection Site	4 (0.8%)	0 (0%)
	Chills	3 (0.6%)	0 (0%)
Cardiovascular	Angina Pectoris	7 (1.3%)	11 (2.0%)
	Hypertension	6 (1.1%)	3 (0.6%)
	Bradycardia	4 (0.8%)	0 (0%)
	Hypotension	5 (0.9%)	3 (0.6%)
Digestive	Nausea	8 (1.5%)	7 (1.3%)
	Diarrhea	5 (0.9%)	4 (0.7%)
	Nausea with Vomiting	5 (0.9%)	5 (0.9%)
	Vomiting	3 (0.6%)	4 (0.7%)
Nervous	Dizziness	4 (0.8%)	1 (0.2%)
Skin	Urticaria	4 (0.8%)	4 (0.7%)
	Rash	3 (0.6%)	4 (0.7%)

 

One or more adverse reactions were reported in 76 of 531 (14.3%) of patients in the clinical trials, coincidental with the administration of OXILAN® or within the study follow-up period of 24 to 72 hours. The incidence and type of adverse reactions were similar to those associated with the nonionic comparator (iohexol) used in the clinical trials. OXILAN®, as do other iodinated contrast agents, often causes warmth and/or pain on injection. The rates are similar to that of the iohexol comparator.

Serious, life threatening and fatal reactions have been associated with the administration of iodine-containing contrast media. In all clinical trials 3/835 (0.3%) patients given OXILAN® and 3/542 (0.6%) given iohexol died 4 days or later after drug administration. In the controlled trials 8/531 (1.5%) patients given OXILAN® and 6/542 (1.1%) given iohexol had serious adverse events.

The following adverse reactions were observed ≤ 0.5% of patients receiving OXILAN® Injection

BODY: allergic reaction, asthenia, chest and back pain, edema of the neck, facial edema, pain, peripheral edema; CARDIOVASCULAR: atrial fibrillation, syncope, tachycardia, vasodilation, ventricular extrasystole; DIGESTIVE: anorexia, constipation, dyspepsia, dysphagia, GI hemorrhage, ileus, liver failure; NERVOUS: hypotonia, nystagmus, paresthesia, somnolence, vertigo; RESPIRATORY: dyspnea, pharyngitis, rhinitis; SKIN: pruritus, sweating; SPECIAL SENSES: amblyopia, conjunctivitis, taste perversion, vision abnormality; UROGENITAL: anuria, dysuria, hematuria, infection of urinary tract, impairment of urination, kidney failure.

Additional adverse events reported in postmarketing surveillance with the use of OXILAN® Injection include: bronchospasm.

Renal toxicity has been reported in a few patients with liver dysfunction who were given an oral cholecystographic agent followed by intravascular contrast agents. Administration of any intravascular contrast agent should therefore be postponed in any patient with a known or suspected hepatic or biliary disorder who has recently received a cholecystographic contrast agent.

Other drugs should not be admixed with OXILAN® (Ioxilan Injection).

Drug/Laboratory Test Interactions

The results of protein bound iodine and radioactive iodine uptake studies, which depend on iodine estimations, will not accurately reflect thyroid function for at least 16 days following administration of iodinated contrast media. However, thyroid function tests which do not depend on iodine estimations, e.g., T3 resin uptake and total or free thyroxine (T4) assays are not affected.

Laboratory Test Findings

In vitro assays were performed with human blood to assess the effects of ioxilan, iohexol and iopamidol on red blood cell morphology and platelet aggregation. Ioxilan, at a concentration of 35 mgI/mL, did not affect red blood cell morphology. Ioxilan, iohexol and iopamidol all inhibited ADP-induced platelet aggregation in a concentration-dependent manner.

In vitro assays with human blood and serum were performed to determine the effects of ioxilan, iohexol, and iopamidol at a dose of 35 mgI/mL on the following coagulation factors; thrombin time, prothrombin time and partial thromboplastin time. Data on reversibility are not available. The thrombin time increased from an average baseline value of 8.0 seconds to average values of 36.9 seconds for ioxilan, (comparable to iohexol and iopamidol.) Prothrombin time increased from an average baseline value of 12.3 seconds to an average value of 17.6 seconds for ioxilan, 18.8 seconds for iopamidol, and 27.8 seconds for iohexol. Partial thromboplastin time increased from an average baseline value of 55.8 seconds to an average value of 77.4 seconds for ioxilan, 89.4 seconds for iohexol, and 70.9 seconds for iopamidol. The duration of these effects was not studied and the clinical impact is unknown.

In vitro assays with human serum were performed to determine the effects of ioxilan and iohexol on complement levels. Total complement consumption (CH50) was not significantly affected by either ioxilan or iohexol. However, the C3 and C4 components of complement decreased by 14% and 19%, respectively, with ioxilan and by 18% and 23% with iohexol. C3c was not detected for either agent.

Severe Adverse Events – Inadvertent Intrathecal Administration

Serious adverse reactions have been reported due to the inadvertent intrathecal administration of iodinated contrast media that are not indicated for intrathecal use. These serious adverse reactions include: death, convulsions, cerebral hemorrhage, coma, paralysis, arachnoiditis, acute renal failure, cardiac arrest, seizures, rhabdomyolysis, hyperthermia, and brain edema. Special attention must be given to insure that this drug product is not administered intrathecally.

Nonionic iodinated contrast media inhibit blood coagulation, in vitro, less than ionic contrast media. Clotting has been reported when blood remains in contact with syringes containing nonionic contrast media. The use of plastic syringes in place of glass syringes has been reported to decrease but not eliminate the likelihood of in vitro clotting. Serious, rarely fatal, thromboembolic events causing myocardial infarction and stroke have been reported during angiographic procedures with both ionic and nonionic contrast media. Therefore, meticulous intravascular administration technique is necessary, particularly during angiographic procedures, to minimize thromboembolic events. Numerous factors, including length of procedure, catheter and syringe material, underlying disease state, and concomitant medications may contribute to the development of thromboembolic events. For these reasons, meticulous angiographic techniques are recommended including close attention to guidewire and catheter manipulation, use of manifold systems and/or three way stopcocks, frequent catheter flushing with heparinized saline solutions, and minimizing the length of the procedure.

Serious or fatal reactions have been associated with the administration of iodine-containing radiopaque media. It is of utmost importance to be completely prepared to treat any contrast agent reaction. Caution must be exercised in patients with severely impaired renal function, combined renal and hepatic disease, combined renal and cardiac disease, severe thyrotoxicosis, myelomatosis, or anuria, particularly when large doses are administered. (See PRECAUTIONS.)

Intravascularly administered iodine-containing radiopaque media are potentially hazardous in patients with multiple myeloma or other paraproteinacious diseases, who are prone to disease-induced renal insufficiency and/or failure. Although neither the contrast agent nor dehydration has been proven to be the cause of renal insufficiency (or worsening renal insufficiency) in myelomatous patients, it has been speculated that the combination of both may be causative. Special precautions, including maintenance of normal hydration and close monitoring, are required. Partial dehydration in the preparation of these patients prior to injection is not recommended since this may predispose the patient to precipitation of the myeloma protein.

Reports of thyroid storm following the intravascular use of iodinated radiopaque agents in patients with hyperthyroidism, or with an autonomously functioning thyroid nodule, suggest that this additional risk be evaluated in such patients before use of any contrast agent.

Severe Cutaneous Adverse Reactions

Severe cutaneous adverse reactions (SCAR) may develop from 1 hour to several weeks after intravascular contrast agent administration. These reactions include Stevens-Johnson syndrome and toxic epidermal necrolysis (SJS/TEN), acute generalized exanthematous pustulosis (AGEP) and drug reaction with eosinophilia and systemic symptoms (DRESS). Reaction severity may increase and time to onset may decrease with repeat administration of contrast agent; prophylactic medications may not prevent or mitigate severe cutaneous reactions. Avoid administering Oxilan to patients with a history of severe cutaneous hypersensitivity reaction to Oxilan.

Administration of radiopaque materials to patients with known or suspected pheochromocytoma should be performed with extreme caution. If, in the opinion of the physician, the possible benefits of such procedures outweigh the considered risks, the procedures may be performed; however, the amount of radiopaque medium injected should be kept to an absolute minimum. The blood pressure should be assessed throughout the procedure and measures for treatment of a hypertensive crisis should be available. These patients should be monitored very closely during contrast enhanced procedures. Contrast agents may promote sickling in individuals who are homozygous for sickle cell disease when administered intravascularly.

General

THE DECISION TO USE CONTRAST ENHANCEMENT IS ASSOCIATED WITH RISK AND INCREASED RADIATION EXPOSURE, AND SHOULD BE BASED UPON A CAREFUL EVALUATION OF CLINICAL, OTHER RADIOLOGIC DATA, AND THE RESULTS OF UNENHANCED CT FINDINGS.

Patients receiving contrast agents, and especially those who are medically unstable, must be closely supervised. Diagnostic procedures which involve the use of iodinated intravascular contrast agents should be carried out under the direction of personnel skilled and experienced in the particular procedure to be performed. A fully equipped emergency cart, or equivalent supplies and equipment, and personnel competent in recognizing and treating adverse reactions of all types should always be available. Since severe delayed reactions have been known to occur, emergency facilities and competent personnel should be available for at least 30 to 60 minutes after administration.

Dehydration, Renal Insufficiency, Congestive Heart Failure: Preparatory dehydration is dangerous and may contribute to acute renal failure in patients with advanced vascular disease, congestive heart disease, diabetic patients, and other patients such as those on medications which alter renal function and the elderly with age related renal impairment. Patients should be adequately hydrated prior to and following the intravascular administration of iodinated contrast agents. Dose adjustments in renal impairment have not been studied.

Iodinated contrast agents may cross the blood-brain barrier. In patients where the blood-brain barrier is known or suspected to be disrupted, or in patients with normal blood-brain barriers and associated renal impairment, CAUTION MUST BE EXERCISED IN CONSIDERING THE USE OF AN IODINATED CONTRAST AGENT. (See Pharmacodynamics.)

Patients with congestive heart failure receiving concurrent diuretic therapy may have relative intravascular volume depletion, which may affect the renal response to the contrast agent osmotic load. Such patients should be observed for several hours following the procedure to detect delayed hemodynamic renal function disturbances.

Immunologic Reactions

The possibility of a reaction, including serious, life-threatening, fatal, anaphylactoid or cardiovascular reactions, should always be considered. Increased risk is associated with a history of previous reaction to a contrast agent, a known sensitivity to iodine and known allergies (i.e., bronchial asthma, hay fever and food allergies) other hypersensitivities, and underlying immune disorders, autoimmunity or immunodeficiencies that predispose to specific or non-specific mediator release.

Skin testing cannot be relied upon to predict severe reactions and may itself be hazardous to the patient. A thorough medical history with emphasis on allergy and hypersensitivity, immune, autoimmune and immunodeficiency disorders, and prior receipt of and response to the injection of any contrast agent, may be more accurate than pretesting in predicting potential adverse reactions.

Premedication with antihistamines or corticosteroids to avoid or minimize possible allergic reactions does not prevent serious life-threatening reactions, but may reduce both their incidence and severity. Extreme caution should be exercised in considering the use of iodinated contrast agents in patients with these histories or disorders.

Anesthesia

General anesthesia may be indicated in the performance of some procedures in selected patients; however, a higher incidence of adverse reactions has been reported in these patients. It is not clear if this is due to the inability of the patient to identify untoward symptoms, or to the hypotensive effect of anesthesia, which can prolong the circulation time and increase the duration of exposure to the contrast agent.

Angiography

In angiographic procedures, the possibility of dislodging plaques or damaging or perforating the vessel wall with resultant pseudoaneurysms, hemorrhage at puncture site, dissection of coronary artery etc., should be considered during catheter manipulations and contrast agent injection. Angiography may be associated with local and distal organ damage, ischemia, thrombosis and organ failure (e.g., brachial plexus palsy, chest pain, myocardial infarction, sinus arrest, hepato-renal function abnormalities, etc.). Test injections to insure proper catheter placement are suggested. Increased thrombosis and activation of the complement system have also occurred. (See WARNINGS.)

Angiography also should be avoided whenever possible in patients with homocystinuria because of the risk of inducing thrombosis and embolism. (See Pharmacodynamics.)

Selective coronary arteriography should be performed only in selected patients and those in whom the expected benefits outweigh the procedural risk. Also, the inherent risks of angiocardiography in patients with chronic pulmonary emphysema must be weighed against the necessity for performing this procedure.

Venography

The safety of ioxilan in venographic procedures has not been studied. Extreme caution during injection of a contrast agent is necessary to avoid extravasation. This is especially important in patients with severe arterial or venous disease.

General Adverse Reactions To Contrast Agents

The following adverse reactions are possible with any parenterally administered iodinated contrast agent. Severe life-threatening reactions and fatalities, mostly of cardiovascular origin, have occurred. Most deaths occur during injection or 5 to 10 minutes later; the main feature being cardiac arrest with cardiovascular disease as the main aggravating factor. Isolated reports of hypotensive collapse and shock are found in the literature. Based upon clinical literature, reported deaths from the administration of other iodinated contrast agents range from 6.6 per 1 million (0.00066 percent) to 1 in 10,000 patients (0.01 percent).

The reported incidence of adverse reactions to contrast agents in patients with a history of allergy is twice that of the general population. Patients with a history of previous reactions to a contrast agent are three times more susceptible than other patients. However, sensitivity to contrast agents does not appear to increase with repeated examinations.

Thyroid function tests indicative of hypothyroidism or transient thyroid suppression have been uncommonly reported following iodinated contrast media administration to adult and pediatric patients, including infants. Some patients were treated for hypothyroidism.

Skin And Subcutaneous Tissue Disorders

Reactions range from mild (e.g. rash, erythema, pruritus, urticaria and skin discoloration) to severe: [e.g. Stevens-Johnson syndrome and toxic epidermal necrolysis (SJS/TEN), acute generalized exanthematous pustulosis (AGEP) and drug reaction with eosinophilia and systemic symptoms (DRESS)].

Adverse reactions to injectable contrast agents fall into two categories: chemotoxic reactions and idiosyncratic reactions. Chemotoxic reactions result from the physicochemical properties of the contrast agent, the dose and the speed of injection. All hemodynamic disturbances and injuries to organs or vessels perfused by the contrast agent are included in this category.

Idiosyncratic reactions include all other reactions. They occur more frequently in patients 20 to 40 years old. Idiosyncratic reactions may or may not be dependent on the dose injected, the speed of injection, the mode of injection and the radiographic procedure. Idiosyncratic reactions are subdivided into minor, intermediate and severe. The minor reactions are self-limited and of short duration; the severe reactions are life-threatening and treatment is urgent and mandatory.

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Long-term animal studies have not been performed with ioxilan to evaluate carcinogenic potential or effects on fertility. Ioxilan was not genotoxic in a series of studies including the Ames test, an in vitro human lymphocytes analysis of chromosomal aberrations, an in vivo mouse micronucleus assay, and in an in vivo mouse dominant lethal assay.

Pregnancy

Teratogenic Effects

Pregnancy Category B

Reproduction studies performed with ioxilan injection in rats at doses up to 6.5 gI/kg (3.7 times the recommended dose for a 50 kg human, or approximately 0.7 times the human dose following normalization of the data to body surface area estimates) and rabbits at doses up to 3.5 gI/kg (2 times the recommended dose for a 50 kg human, or approximately the same as the human dose following normalization of the data to body surface area estimates) did not reveal evidence of direct harm to the fetus. Embryolethality was not detected. Adequate and well-controlled studies in pregnant women have not been conducted. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

Nursing Mothers

It is not known whether ioxilan is excreted in human milk. However, many injectable contrast agents are excreted unchanged in human milk. Although it has not been established that serious adverse reactions occur in nursing infants, caution should be exercised when intravascular contrast media are administered to nursing women because of potential adverse reactions, and consideration should be given to temporarily discontinuing nursing.

Pediatric Use

Safety and effectiveness in children have not been established.

The adverse effects of overdosage are life-threatening and affect mainly the pulmonary and cardiovascular systems. Treatment of overdosage is directed toward the support of all vital functions, and prompt institution of symptomatic therapy.

OXILAN® Injection binds negligibly to plasma or serum protein and can, therefore, be dialyzed.

Contraindications

OXILAN® Injection is not indicated for intrathecal use.

General

Ioxilan is a nonionic, water soluble, triiodinated x-ray contrast agent for intravascular injection. Intravascular injection of a radiopaque diagnostic agent opacifies those vessels in the path of flow of the contrast medium, permitting radiographic visualization of the internal structures of the human body until significant hemodilution occurs.

Pharmacokinetics

In healthy young (21-27 years) male (n = 4) and female volunteers (n = 4) who each received OXILAN® Injection, 72.8 g ioxilan (35.0 g iodine), the drug showed biphasic and first order pharmacokinetics. Ioxilan is distributed mainly in the blood as suggested by the apparent volume of distribution (central compartment), 7.2 ± 1.0 L in women and 10.0 ± 2.4 L in men (mean ± sd). The total clearance values were 95.4 ± 11.1 mL•min-1 and 101.0 ± 14.7 mL•min-1 and the renal clearance values were 89.4 ± 13.3 mL•min-1 and 94.9 ± 16.6 mL•min-1 for women and men, respectively. An initial fast distribution phase with a half-life of 13.1 ± 4.2 minutes (women) or 23.5 ± 15.3 minutes (men) was followed by an elimination phase with a half-life of 102.0 ± 16.9 minutes (women) and 137 ± 35.4 minutes (men). Binding of ioxilan to plasma protein is negligible.

The average amount of ioxilan excreted unchanged in urine at 24 hours represents 93.7% of the dose in young healthy subjects (21-27 years) after intravenous administration of OXILAN® Injection. This finding suggests that, compared to the renal excretion, biliary and/or gastrointestinal excretion are not important for OXILAN®.

The pharmacokinetics profile and total clearance of ioxilan in patients with significantly impaired renal function have not been studied. In pooled data from 80 subjects with abnormal baseline BUNS or creatinines, who received either ioxilan (n = 44) or iohexol (n = 36), there was a higher occurrence of post-procedure increased creatinine levels (p = 0.008); also, the systolic pressure was lower at 2-6 hours (p = 0.043). Dose adjustment in patients with renal failure and blood brain barrier interaction has not been studied. OXILAN® Injection binds negligibly to plasma or serum protein and can be dialyzed.

Metabolism

There is no evidence for metabolism of OXILAN® Injection.

Pharmacodynamics

As with other iodinated contrast agents, following OXILAN® Injection, the degree of contrast enhancement is directly related to the iodine content in the administered dose; peak iodine plasma levels occur immediately following rapid intravenous injection. Iodine plasma levels fall rapidly within 5 to 10 minutes. This can be accounted for by the dilution in the vascular and extravascular fluid compartments.

Intravascular Contrast: Contrast enhancement appears to be greatest immediately after bolus injections (15 seconds to 120 seconds). Thus, greatest enhancement may be detected by a series of consecutive two-to-three second scans performed within 30 to 90 seconds after injection (i.e., dynamic computed tomographic imaging).

OXILAN® Injection may be visualized in the renal parenchyma within 30-60 seconds following rapid intravenous injection. Opacification of the calyces and pelves in patients with normal renal function becomes apparent within 1-3 minutes, with optimum contrast occurring within 5-15 minutes.

Contrast Enhanced Computerized Tomography (CECT): AS WITH OTHER IODINATED CONTRAST AGENTS, THE USE OF OXILAN® INJECTION CONTRAST ENHANCEMENT MAY OBSCURE SOME LESIONS WHICH WERE SEEN ON PREVIOUSLY UNENHANCED CT SCANS.

In CECT some performance characteristics are different in the brain and body. In CECT of the body, iodinated contrast agents diffuse rapidly from the vascular into the extravascular space. Following the administration of iodinated contrast agents, the increase in tissue density to x-rays is related to blood flow, the concentration of the contrast agent, and the extraction of the contrast agent by various interstitial tissues. Contrast enhancement is thus due to any relative differences in extravascular diffusion between adjacent tissues.

In the normal brain with an intact blood-brain barrier, contrast is generally due to the presence of iodinated contrast agent within the intravascular space. The radiographic enhancement of vascular lesions, such as arteriovenous malformations and aneurysms, depends on the iodine content of the circulating blood pool.

In tissues with a break in the blood-brain barrier, contrast agent accumulates within interstitial brain tissue. The time to maximum contrast enhancement can vary from the time that peak blood iodine levels are reached to 1 hour after intravenous bolus administration. This delay suggests that radiographic contrast enhancement is at least in part dependent on the accumulation of iodine containing medium within the lesion and outside the blood pool. The mechanism by which this occurs is not clear.

IN PATIENTS WITH NORMAL BLOOD BRAIN BARRIERS and RENAL FAILURE, iodinated contrast agents have been associated with blood brain barrier DISRUPTION and ACCUMULATION OF CONTRAST IN THE BRAIN. (See PRECAUTIONS.)

The usefulness of contrast enhancement for the investigation of the retrobulbar space and of low grade or infiltrative glioma has not been demonstrated. Calcified lesions are less likely to enhance. The enhancement of tumors after therapy may decrease. The opacification of the inferior vermis following contrast agent administration has resulted in false-positive diagnosis. Cerebral infarctions of recent onset may be better visualized with contrast enhancement. Older infarctions are obscured by the contrast agent.

For information on coagulation parameters, fibrinolysis and complement system, please refer to the Laboratory Test Findings section.

Clinical Trials

OXILAN® Injection was administered to 834 patients in controlled and uncontrolled studies. Of these 679 patients were between 18 and 69 years of age, and 155 patients were 70 years of age or older; the mean age was 56.4 years (range 18-88). Of the 834 patients, 579 (69%) were male and 255 (31%) were female. The racial distribution was: Caucasian 668 (80%), Black 84 (10%), Hispanic 58 (7%), Asian 14 (2%), and other or unknown 10 (1%). The demographic information for patients who received the comparator (iohexol) was similar.

In the controlled studies, 530 patients given OXILAN® Injection and 540 patients given the comparator (iohexol) were evaluated for efficacy. Efficacy assessment was based on the global evaluation of the quality of the radiographs by rating visualization as either excellent, good, poor, or no image, and on the ability to make a diagnosis. Results were compared to those with the active control (iohexol injection) at concentrations which were identical to those of OXILAN® Injection.

Four (4) intraarterial and three (3) intravenous procedures were studied with 1 of 2 concentrations (350 mgI/mL and 300 mgI/mL). These procedures were: aortography/visceral angiography, coronary arteriography and left ventriculography, cerebral arteriography, peripheral arteriography, contrast-enhanced computed tomography (CECT) of head and body, and excretory urography.

Cerebral arteriography was evaluated in 3 randomized, double-blind clinical trials of OXILAN® Injection 300 mgI/mL in patients with conditions such as altered cerebrovascular perfusion and/or permeability occurring in central nervous system diseases due to various CNS disorders. Results were assessed in 78 patients with OXILAN® (Ioxilan Injection) and 83 with iohexol injection 300 mgI/mL. Visualization ratings were good or excellent in 95% of the patients with OXILAN® Injection; a radiologic diagnosis was made in the majority of the patients. The results were similar to those with iohexol injection. Confirmation of the radiologic findings by other diagnostic methods was not obtained.

Coronary arteriography/left ventriculography was evaluated in 4 randomized, double-blind clinical trials of OXILAN® Injection 350 mgI/mL in patients with conditions such as altered coronary artery perfusion due to metabolic causes and in patients with conditions such as altered ventricular function. Results were assessed in 139 patients with OXILAN® Injection and 142 with iohexol injection 350 mgI/mL. Visualization ratings were good or excellent in 99% or more of the patients with OXILAN® Injection; a radiologic diagnosis was made in the majority of the patients. The results were similar to those with iohexol injection. Confirmation of the radiologic findings by other diagnostic methods was not obtained.

Aortography/visceral angiography was evaluated in 3 randomized, double-blind clinical trials of OXILAN® Injection 350 mgI/mL in patients with conditions such as altered aortic blood flow and/or visceral vascular disorders. The results were assessed in 51 patients with OXILAN® Injection 350 mgI/mL and 47 with iohexol injection 350 mgI/mL. Visualization ratings were good or excellent in the majority of the patients; a radiologic diagnosis was made in 90% of the patients with OXILAN® Injection. The results were similar to those with iohexol injection. Confirmation of radiologic findings by other diagnostic methods was not obtained. Intravenous excretory urography was evaluated in 2 randomized, double-blind clinical trials of OXILAN® Injection 350 mgI/mL. The results were assessed in 61 patients with OXILAN® Injection 350 mgI/mL and 62 with iohexol injection 350 mgI/mL. Visualization ratings were good or excellent in all of the patients; a radiologic diagnosis was made in 100% of the patients with OXILAN® Injection. The results were similar to those with iohexol injection. Confirmation of radiologic findings by other diagnostic methods was not obtained.

CECT of head and body was evaluated in 5 randomized, double-blind clinical trials in patients with vascular disorders. A total of 146 patients received OXILAN® Injection 300 mgI/mL and 149 received iohexol injection 300 mgI/mL. Visualization ratings were good or excellent in 98% of the patients with OXILAN® Injection; a radiologic diagnosis was made in the majority of the patients. The results were similar to those with iohexol injection.