SPL Set ID: 5ff2cd9e-a579-48f5-845f-c37a68372a34

Pioglitazone and metformin HCl tablets USP are a thiazolidinediones and biguanide combination product that contains two oral antidiabetic medications: pioglitazone hydrochloride USP and metformin hydrochloride USP. Pioglitazone [(±)-5-[[4-[2-(5-ethyl-2-pyridinyl) ethoxy]phenyl]methyl]-2,4-] thiazolidinedione monohydrochloride contains one asymmetric carbon, and the compound is synthesized and used as the racemic mixture. The two enantiomers of pioglitazone interconvert in vivo. No differences were found in the pharmacologic activity between the two enantiomers. The structural formula is as shown: Pioglitazone HCl USP is an odorless white crystalline powder that has a molecular formula of C 19 H 20 N 2 O 3 S•HCl and a molecular weight of 392.90 daltons. It is soluble in N,N-dimethylformamide, slightly soluble in anhydrous ethanol, very slightly soluble in acetone and acetonitrile, practically insoluble in water, and insoluble in ether. Metformin HCl USP (N,N-dimethylimidodicarbonimidic diamide hydrochloride) is a white crystalline powder with a molecular formula of C 4 H 11 N 5 •HCl and a molecular weight of 165.62. Metformin hydrochloride USP is freely soluble in water and is practically insoluble in acetone, ether, and chloroform. The pKa of metformin is 12.4. The pH of a 1% aqueous solution of metformin hydrochloride USP is 6.68. The structural formula is as shown: Pioglitazone and metformin HCl tablets USP are available as a tablet for oral administration containing 15 mg pioglitazone (as the base) with 500 mg metformin HCl USP (15 mg/500 mg) or 15 mg pioglitazone (as the base) with 850 mg metformin HCl USP (15 mg/850 mg) formulated with the following excipients: Croscarmellose sodium, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, povidone, talc and titanium dioxide. USP dissolution test 1. metpio metpio