A pill imprinted with the markings "M385" is acetaminophen/hydrocodone 500 milligrams/7.5 milligrams, according to Drugs.com. It is a prescription pain reliever made by the pharmaceutical company Watson. Hydrocodone is sold under several brand names and is a narcotic pain medication that is controlled under the provisions of the Controlled Substances Act.
Hydrocodone is sold under four brand names as of 2015: Lorcet, Lortab, Norco and Vicodin, according to WebMD. It is part of a class of drugs known as opioids. These drugs work by binding with opioid receptors in the brain, spinal cord and elsewhere. Because they reduce the signals the brain receives when it feels pain, they also reduce the feelings pain causes.
Hydrocodone and other opioid medications are available by prescription only, notes WebMD. They are prescribed for use in treating moderate to severe pain, usually as a second-line treatment when over-the-counter or other pain medications fail to control symptoms of pain.
Because opioid medications have a strong correlation with dependency, doctors closely monitor those taking them and don't recommend long-term use of the drugs. Users may experience side effects such as constipation, nausea, vomiting and drowsiness. When taking hydrocodone and other opioid medications, avoid mixing use with alcohol, as the combination can be dangerous.