Overview
11 DESCRIPTION Iohexol is a nonionic radiographic contrast agent available as: OMNIPAQUE (iohexol) injection for intrathecal, intra-arterial, intravenous, oral, rectal, intraarticular, and body cavity use OMNIPAQUE (iohexol) oral solution for oral use The chemical name of iohexol is Bis(2,3-dihydroxypropyl)-5-[ N -(2,3-dihydroxypropyl)-acetamido]-2,4,6- triiodoisophthalamide with a molecular...
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action The iodine atoms in iohexol provide attenuation of X-rays in direct proportion to the concentration of iohexol. Since concentration changes over time, iohexol provides time-dependent image contrast which may assist in visualizing body structures. 12.2 Pharmacodynamics Intrathecal Administration The initial concentration and volume of the contrast medium, in conjunction with patient manipulation and the volume of cerebrospinal fluid (CSF) into which the contrast medium is placed, will determine the extent of the contrast that can be achieved. Following intrathecal injection in conventional radiography, OMNIPAQUE 180 mg iodine/mL, 240 mg iodine/mL, and 300 mg iodine/mL will continue to provide contrast for at least 30 minutes.
Indications
- 1 INDICATIONS AND USAGE OMNIPAQUE is a radiographic contrast agent indicated for intrathecal, intra-arterial, intravenous, oral, rectal, intraarticular, and body cavity imaging procedures in adults and pediatric patients. ( 1 ) 1.1 Intrathecal Procedures ‡ OMNIPAQUE is indicated for: Myelography and computerized tomography (CT) myelography (lumbar, thoracic, cervical, total columnar) in adults and pediatric patients aged 2 weeks and older CT cisternography in adults and pediatric patients aged 2 weeks and older 1.
Common Doses
- 500 mL
- 10 mL
- 17 mL
- 7 mL
Dosage
2 DOSAGE AND ADMINISTRATION For each imaging procedure, specific dosage forms, concentrations, and presentations are recommended. Individualize the concentration and volume according to the specific dosing tables and accounting for factors such as age, body weight, and condition of the patient, and the equipment and imaging technique used. ( 2.2 , 2.3 , 2.4 , 2.5 , 2.6 , 2.7 , 2.8 , 2.9 ) See full prescribing information for complete dosing and administration information. ( 2 ) 2.
Black Box Warning
WARNING: RISKS ASSOCIATED WITH INTRATHECAL ADMINISTRATION OF OMNIPAQUE INJECTION 140 mg IODINE/mL and 350 mg IODINE/mL Use only the OMNIPAQUE iodine concentrations and presentations recommended for intrathecal procedure [see Dosage and Administration (2.2 , 2.8) ]. Intrathecal administration of OMNIPAQUE of a wrong iodine concentration, even if inadvertent, may cause death, convulsions, seizures, cerebral hemorrhage, coma, paralysis, arachnoiditis, acute renal failure, cardiac arrest, rhabdomyolysis, hyperthermia, and brain edema [see Warnings and Precautions (5.1) ].
Contraindications
- 4 CONTRAINDICATIONS OMNIPAQUE for hysterosalpingography is contraindicated during pregnancy or suspected pregnancy, menstruation or when menstruation is imminent, within 6 months after termination of pregnancy, within 30 days after conization or curettage, when signs of infection are present in any portion of the genital tract including the external genitalia, and when reproductive tract neoplasia is known or suspected because of the risk of peritoneal spread of neoplasm.
Side Effects
- 6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Risks Associated with Intrathecal Administration of OMNIPAQUE Injection 140 mg Iodine/mL and 350 mg Iodine/mL [see Warnings and Precautions (5.1) ] Risks Associated with Parenteral Administration of OMNIPAQUE Oral Solution [see Warnings and Precautions (5.2) ] Hypersensitivity Reactions [see Warnings and Precautions (5.3) ] Acute Kidney Injury [see Warnings and Precautions (5.4) ] Cardiovascular Adverse Reactions [see Warnings and Precautions (5.
Interactions
- 7 DRUG INTERACTIONS 7.1 Drug-Drug Interactions Metformin In patients with renal impairment, metformin can cause lactic acidosis. Iodinated contrast agents appear to increase the risk of metformin-induced lactic acidosis, possibly as a result of worsening renal function. Stop metformin at the time of, or prior to, OMNIPAQUE administration in patients with an eGFR between 30 and 60 mL/min/1.73 m 2 ; in patients with a history of hepatic impairment, alcoholism or heart failure; or in patients who will be administered intra-arterial iodinated contrast.