Metformin is the most common drug that doctors prescribe to treat type 2 diabetes. Recently, the U.S. Food and Drug Administration (FDA) recommended prohibiting certain kinds of metformin that are extended release capsules. This is because new testing shows that there is a high level of a toxic chemical called NDMA (nitrosodimethylamine) in this drug. This chemical is bad for the body and can even cause cancer. There are other types of metformin, such as immediate-release capsules, that do not have this dangerous chemical. Therefore, doctors can still prescribe metformin immediate-release for those with diabetes.

Source: https://www.medscape.com/viewarticle/931361

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