Hydrocodone m367 is an imprint on a pill identified as white in a capsule shape. The pill is a combination of two active ingredients: acetaminophen 325 mg and hydrocodone bitartrate 10 mg. It is used to relieve moderate to severe pain. M367 pill contains an opioid (narcotic) pain reliever, hydrocodone, and a non-opioid pain reliever, acetaminophen. Acetaminophen is a less potent pain reliever added to this combination to increase the hydrocodone effects. It is supplied by Mallinckrodt Pharmaceuticals.