Methadone DescriptionMethadone, sold under the brand name Dolophine among others, is an opioid used for opioid maintenance therapy in opioid dependence and for chronic pain management. Detoxification using methadone can be accomplished in less than a month, or it may be done gradually over as long as six months. Wikipedia Formula: C21H27NO Molar mass: 309.445 g/mol CAS ID: 76-99-3 ChemSpider ID: 3953 ChEMBL Id: 651 IUPHAR ID: 5458 People also search for: Buprenorphine, Heroin, Oxycodone.