The White, Elliptical / Oval pill with imprint M366 has been identified as Acetaminophen and Hydrocodone Bitartrate 325 mg / 7.5 mg. It is supplied by Mallinckrodt Pharmaceuticals. Acetaminophen/hydrocodone is used in the treatment of back pain; pain; cough and belongs to the drug class narcotic analgesic combinations. Risk cannot be ruled out during pregnancy. […]