Irbesartan

11 DESCRIPTION Irbesartan is an angiotensin II receptor (AT 1 subtype) antagonist.‍​‍‍‍​‍‍‍‍‍‍‍‍​‍ Irbesartan is a non-peptide compound, chemically described as a 2-butyl-3-[ p -( o -1 H -tetrazol-5‑ylphenyl)benzyl]-1,3-diazaspiro[4.4]non-1-en-4-one. Its empirical formula is C 25 H 28 N 6 O, and the structural formula: Irbesartan is a white to off-white crystalline powder with a molecular weight of 428.5. It is a nonpolar compound with a partition coefficient (octanol/water) of 10.1 at pH of 7.4. Irbesartan is slightly soluble in alcohol and methylene chloride and practically insoluble in water. Irbesartan tablets are available for oral administration in unscored tablets containing 75 mg, 150 mg, or 300 mg of irbesartan. Inactive ingredients include: lactose monohydrate, microcrystalline cellulose, croscarmellose sodium, hypromellose, and magnesium stearate. Structure