Synonyms: Metformin Hydrochloride Imp. E (EP) as Hydrochloride,1-Methylbiguanide Hydrochloride, Imidodicarbonimidic diamide, N-methyl-, hydrochloride (1:1) (ACI), Biguanide, 1-methyl-, hydrochloride (6CI, 7CI, 8CI), Imidodicarbonimidic diamide, N-methyl-, monohydrochloride (9CI), 1-Methylbiguanide Hydrochloride, N’-Methylbiguanide monohydrochloride