Ezetimibe and Simvastatin Tablets contain ezetimibe, a selective inhibitor of intestinal cholesterol and related phytosterol absorption, and simvastatin, an HMG-CoA reductase inhibitor.
The chemical name of ezetimibe is 1-(4-fluorophenyl)-3(R)-[3-(4-fluorophenyl)-3(S)-hydroxypropyl]-4(S)-(4-hydroxyphenyl)-2-azetidinone. The empirical formula is C24H21F2NO3 and its molecular weight is 409.44.
Ezetimibe is a white, crystalline powder that is freely soluble in ethanol, methanol and acetone and practically insoluble in water. Its structural formula is:
Ezetimibe-structure (Ezetimibe Structure)
Simvastatin, an inactive lactone, is hydrolyzed to the corresponding β-hydroxyacid form, which is an inhibitor of HMG-CoA reductase. Simvastatin is butanoic acid, 2,2-dimethyl-,1,2,3,7,8,8a-hexahydro-3,7-dimethyl-8-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)-ethyl]-1-naphthalenyl ester, [1S-[1α,3α,7α,8α(2S*,4S*),-8aβ]]. The empirical formula of simvastatin is C25H38O5 and its molecular weight is 418.57.
Simvastatin is a white to off-white, nonhygroscopic powder that is freely soluble in chloroform, methanol and alcohol, sparingly soluble in propylene glycol, very slightly soluble in hexane and practically insoluble in water. Its structural formula is:
Simva-structure (Simva Structure)
Ezetimibe and Simvastatin Tablets are available for oral use as tablets containing 10 mg of ezetimibe, and either 10 mg of simvastatin (Ezetimibe and Simvastatin Tablets 10 mg/10 mg), 20 mg of simvastatin (Ezetimibe and Simvastatin Tablets 10 mg/20 mg), 40 mg of simvastatin (Ezetimibe and Simvastatin Tablets 10 mg/40 mg), or 80 mg of simvastatin (Ezetimibe and Simvastatin Tablets 10 mg/80 mg). Each tablet contains the following inactive ingredients: butylated hydroxyanisole, citric acid monohydrate, croscarmellose sodium, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, propyl gallate, and sodium lauryl sulfate.