Mealey's (June 2, 2020, 2:52 PM EDT) -- SILVER SPRING, Md. — The Food and Drug Administration on May 28 alerted patients and health care professionals that laboratory tests revealed unacceptably high levels of N-nitrosodimethylamine (NDMA) in extended release versions of the diabetes drug metformin and asked five drug companies to voluntarily withdraw the drugs from the market....