title: Supplementary methadone self administration among methadone maintenance clients.
mesh_terms: D000328:Adult; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D008691:Methadone / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D012646:Self Administration
chemical_list: D008691:Methadone