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 molecular formula is C24H21F2NO3 and its molecular weight is 409.44 g/mol.
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 molecular formula of simvastatin is C25H38O5 and its molecular weight is 418.57 g/mol.
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 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.