Mayomeds Pharmaceuticals offers the white, oval pill with the marking M366, which contains 325 mg of hydrocodone bitartrate and 7.5 mg of acetaminophen. Acetaminophen/hydrocodone is classified as a narcotic analgesic combination medication and is commonly prescribed for back pain, pain, and cough. It is important to note that the use of this medication during pregnancy carries potential risks. The Controlled Substance Act (CSA) categorizes acetaminophen/hydrocodone (325 mg / 7.5 mg) as a Schedule 2 controlled substance.