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Omniscan

Drug Description
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OMNISCAN™
(gadodiamide) Injection for Intravenons Use

WARNING: NOT FOR INTRATHECAL USE and NEPHROGENIC SYSTEMIC FIBROSIS (NSF)

NOT FOR INTRATHECAL USE

Inadvertent intrathecal use of OMNISCAN has caused convulsions, coma, sensory and motor neurologic deficits [see Warnings and PRECAUTIONS].

NSF

Gadolinium-based contrast agents increase the risk for NSF in patients with:

  • acute or chronic severe renal insufficiency (glomerular filtration rate < 30 mL/min/1.73m2), or
  • acute renal insufficiency of any severity due to the hepato-renal syndrome or in the perioperative liver transplantation period.

In these patients, avoid use of gadolinium-based contrast agents unless the diagnostic information is essential and not available with non-contrast enhanced magnetic resonance imaging (MRI). NSF may result in fatal or debilitating systemic fibrosis affecting the skin, muscle, and internal organs. Screen all patients for renal dysfunction by obtaining a history and laboratory tests. When administering a gadolinium-based contrast agent, do not exceed the recommended dose and allow a sufficient period of time for elimination of the agent from the body prior to any readministration [see Warnings and PRECAUTIONS].

DRUG DESCRIPTION

OMNISCAN (gadodiamide) Injection is the formulation of the gadolinium complex of diethylenetriamine pentaacetic acid bismethylamide, and is an injectable, nonionic extracellular enhancing agent for magnetic resonance imaging. OMNISCAN is administered by intravenous injection. OMNISCAN is provided as a sterile, clear, colorless to slightly yellow, aqueous solution. Each 1 mL contains 287 mg gadodiamide and 12 mg caldiamide sodium in Water for Injection. The pH is adjusted between 5.5 and 7.0 with hydrochloric acid and/or sodium hydroxide. OMNISCAN contains no antimicrobial preservative. OMNISCAN is a 0.5 mol/L solution of aqua[5,8-bis(carboxymethyl)-ll-[2-(methylamino)-2-oxoethyl]-3-oxo- 2,5,8,1 l-tetraazatridecan-13-oato (3-)-N5, N8, N11, O3, O5, O8, O11, O13] gadolinium hydrate, with a molecular weight of 573.66 (anhydrous), an empirical formula of C16H28GdN5O9•xH2O2, and the following structural formula:

OMNISCAN (gadodiamide) structural formula illustration

Pertinent physicochemical data for OMNISCAN are noted below:

PARAMETER
Osmolality (mOsmol/kg water) @37°C 789
Viscosity (cP) @20°C 2
@37°C 1.4
Density (g/mL) @25°C 1.14
Specific gravity @25°C 1.15

OMNISCAN has an osmolality approximately 2.8 times that of plasma at 37°C and is hypertonic under conditions of use.

Brand Name: Omniscan
Generic Name: Gadodiamide
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