While most people tolerate this medication well, there are some potential metformin risks. In clinical studies, a number of side effects were reported with this drug. Nausea and vomiting,
diarrhea, gas, and weakness were some of the most common side effects that were seen in people taking metformin.
There are also a number of potentially serious side effects that may occur with metformin. You should notify your healthcare provider immediately if you develop chest pain, symptoms of high blood sugar (such as blurred vision or increased hunger), or symptoms of low blood sugar (such as cold sweats or difficulty speaking).
(Click Metformin Side Effects to learn about other potential metformin risks, including other possible side effects and complications that may occur with this medication.)