SPL Set ID: 93c8deae-3103-4cbf-a5d1-fe0d37e76df8

Metformin Hydrochloride Extended-release Tablets, USP contain the antihyperglycemic agent metformin, which is a biguanide, in the form of monohydrochloride. The chemical name of metformin hydrochloride is N,N- dimethylimidodicarbonimidic diamide hydrochloride . The structural formula is as shown below: Metformin hydrochloride, USP is a white to off-white crystalline compound with a molecular formula of C 4 H 11 N 5. HCl and a molecular weight of 165.63. It 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 6.86. Metformin Hydrochloride Extended-release Tablets USP, contains 500 mg or 750 mg of metformin hydrochloride, which is equivalent to 389.93 mg, 584.90 mg metformin base, respectively. Metformin Hydrochloride Extended-release Tablets, USP 500 mg and 750 mg contain the inactive ingredients hypromellose, microcrystalline cellulose, povidone, sodium carboxymethyl cellulose, and magnesium stearate. System Components and Performance- Metformin Hydrochloride Extended-release Tablets comprises a dual hydrophilic polymer matrix system. Metformin hydrochloride is combined with a drug release controlling polymers to form a monophasic matrix system. After administration, fluid from the gastrointestinal (GI) tract enters the tablet, causing the polymers to hydrate and swell. Drug is released slowly from the dosage form 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. Dissolution Method: Test 24 image