In First 2022 Recall, Metformin Pulled Back Because of Carcinogenic NDMA. Problems with N-nitrosodimethylamine (NDMA)-contaminated metformin were identified by the FDA in 2020.Jan 14, 2022

Common side effects

Nausea, vomiting, stomach upset, diarrhea, weakness, or a metallic taste in the mouth may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. If stomach symptoms return later (after taking the same dose for several days or weeks), tell your doctor right away.

What is the most serious side effect of metformin?

Under certain conditions, too much metformin can cause lactic acidosis. The symptoms of lactic acidosis are severe and quick to appear, and usually occur when other health problems not related to the medicine are present and are very severe, such as a heart attack or kidney failure.

Can you get withdrawals from metformin?

Metformin works by decreasing the amount of sugar your liver releases into your blood, making your body more sensitive to insulin's effects. If you suddenly discontinue use, it can lead to dangerously high blood sugar levels. 1 As a result, you may experience: Headache.Aug 21, 2020