SPL Set ID: 4833deea-a19d-63b1-e054-00144ff8d46c

Metformin hydrochloride extended release tablets USP is an oral antihyperglycemic drug used in the management of type 2 diabetes. Metformin hydrochloride (N,N-dimethylimidodicar- bonimidic diamide hydrochloride) is not chemically or pharmacologically related to any other classes of oral antihyperglycemic agents. The structural formula is as shown: [Structural Formula] Metformin hydrochloride is a white to off-white crystalline compound with a molecular formula of C4H11N5• HCl and a molecular weight of 165.63. Metformin hydrochloride 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 is 6.68. Metformin hydrochloride extended release tablets USP contain 500 mg of metformin hydrochloride USP as the active ingredient. Metformin hydrochloride extended release tablets USP 500 mg contain the inactive ingredients sodium carboxymethyl cellulose, hypromellose and magnesium stearate. Metformin hydrochloride extended release tablets USP 500 mg meets USP dissolution Test 3. System Components and Performance- Metformin hydrochloride extended release tablets USP comprises a swellable matrix system. In the aqueous gastrointestinal (GI) environment, the dosage form swells remarkably thereby increasing in size and geometry from where drug is released slowly by a process of diffusion through the gel matrix that is essentially independent of pH. The hydrated polymer system is not rigid and is expected to be broken up by normal peristalsis in the GI tract. The biologically inert components of the tablet may occasionally remain intact during GI transit and will be eliminated in the feces as a soft, hydrated mass.