title: Methadone maintenance and amitriptyline.
mesh_terms: D000639:Amitriptyline; D006801:Humans; D008691:Methadone / Q000627:therapeutic use*; D019966:Substance-Related Disorders / Q000209:etiology* / Q000534:rehabilitation*
chemical_list: D000639:Amitriptyline; D008691:Methadone