title: Enhancement of morphine analgesia by tricyclic antidepressants.
mesh_terms: D000639:Amitriptyline / Q000494:pharmacology; D000698:Analgesia; D000818:Animals; D000929:Antidepressive Agents, Tricyclic / Q000494:pharmacology*; D002415:Cats; D004357:Drug Synergism; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009661:Nortriptyline / Q000494:pharmacology; D011930:Reaction Time / Q000187:drug effects; D013997:Time Factors
chemical_list: D000929:Antidepressive Agents, Tricyclic; D000639:Amitriptyline; D009020:Morphine; D009661:Nortriptyline