Buprenorphine, sold under the brand name Subutex, among others, is an opioid used to treat opioid addiction, acute pain, and chronic pain. It can be used under the tongue, by injection, as a skin patch, or as an implant. When used for opioid addiction it is recommended that a health care provider observe the person while they take the medication. For longer term treatment of addiction a combination formulation of buprenorphine/naloxone is usually recommended. Maximum pain relief is generally within an hour with effects up to 24 hours.