Metformin: medicine to treat type 2 diabetes - NHS
https://www.nhs.uk/medicines/metforminMetformin is a medicine used to treat type 2 diabetes, and to help prevent type 2 diabetes if you're at high risk of developing it.. Metformin is used when treating polycystic ovary syndrome (PCOS), although it's not officially approved for PCOS.. Type 2 diabetes is an illness where the body does not make enough insulin, or the insulin that it makes does not work properly.