Methadone maintenance.
D000222:Adaptation, Physiological; D000818:Animals; D004924:Escape Reaction; D006240:Happiness; D006556:Heroin Dependence / Q000188:drug therapy* / Q000534:rehabilitation; D006801:Humans; D008691:Methadone / Q000008:administration & dosage* / Q000627:therapeutic use; D012309:Risk-Taking; D012925:Social Conformity; D014481:United States
D008691:Methadone