Metformin (Glucophage®) is an anti-diabetic drug from the biguanide class (its other members are the withdrawn agents phenformin and buformin).

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... METFORMIN (Glucophage®) is a medicine used to treat type 2 diabetes mellitus. Treatment is combined with a balanced diet and exercise. This medicine lowers blood sugar and helps your body to use insulin more efficiently. It is sometimes used with other medicines for diabetes. Generic metformin tablets are available. ...
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Metformin Systematic (IUPAC) name 1-(diaminomethylidene)-3,3-dime ...
Wikipedia - [full article]

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