title: Why is methadone maintenance successful?
mesh_terms: D004336:Drug Antagonism; D004335:Drug and Narcotic Control; D005845:Georgia; D006556:Heroin Dependence / Q000188:drug therapy* / Q000628:therapy; D006801:Humans; D008691:Methadone / Q000600:supply & distribution / Q000627:therapeutic use*
chemical_list: D008691:Methadone