title: Sites of action of narcotic and nonnarcotic analgesics: mechanism of pain and analgesia.
mesh_terms: D000698:Analgesia; D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D004285:Dogs; D006801:Humans; D009294:Narcotics / Q000494:pharmacology*; D010146:Pain / Q000188:drug therapy*
chemical_list: D000700:Analgesics; D009294:Narcotics