The US Food and Drug Administration has found high levels of a carcinogenic chemical in some pills of Metformin, a popular diabetes drug. According to a Bloomberg report, some extended-release version of the drug had unacceptable amounts of NDMA, a probable human carcinogen. The drug is taken by people with type 2 diabetes, to control high blood sugar. Some recalls may be witnessed this week, however, it is unclear which companies will be removing their products from the shelves. Patients must consult their doctors before deciding to stop to take the medication, the report cautioned.