title: Opioids in mental illness: theories, clinical observations, and treatment possibilities.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D001523:Mental Disorders / Q000188:drug therapy*; D009294:Narcotics / Q000627:therapeutic use
chemical_list: D004723:Endorphins; D009294:Narcotics