A pill scored with an M357 imprint is an acetaminophen and hydrocodone bitartrate, according to Drugs.com. It is typically white in color and oval in shape. Acetaminophen/hydrocodone is a Schedule 2 controlled substance and has a high potential of abuse. As a narcotic, this medication is only available by prescription.
The acetaminophen/hydrocodone combination is commonly prescribed for back pain, rheumatoid arthritis and cough, as Drugs.com details. The M357 imprint has a strength of 500 milligrams acetaminophen and 5 milligrams hydrocodone per tablet. Common inactive ingredients include corn starch; crosposvidone, which aids in absorption; silicon dioxide, an anti-caking agent; and stearic acid, for the wax-like coating.