
Metformin found to be contaminated with cancer-causing agents
U.S. health regulators are telling five drugmakers to recall their versions of a widely used diabetes medication after laboratory tests found elevated levels of a contaminant linked to cancer. The Food and Drug Administration said late Thursday that several batches of the drug metformin tested positive for unsafe levels of N-Nitrosodimethylamine, a possible cancer-causing chemical that can form as a manufacturing byproduct. The agency has stepped up testing after the chemical