Metformin HCl is an oral antihyperglycemic drug. Metformin HCl is N, N-dimethylimidodicarbonimidic diamide hydrochloride chemically. It is a white to off-white crystalline powder. It is freely soluble in water and is practically insoluble in acetone, chloroform and ether. Its molecular formula is C4H11N5·HCl.