A randomized, balanced, open label, crossover, two period, two treatment, two sequence, single dose, oral bioequivalence study under fasting condition. It is a pivotal study to demonstrate the bioequivalence of Metformin 850 mg tablets manufactured by Savipharm J.S.C, Vietnam and Glucophage® 850 mg tablets of Merck Sante, France, in healthy adult human male subjects under fasting condition.