title: Increased sensitivity of the central nervous system to morphine analgesia by amitriptyline in naive and morphine-tolerant rats.
mesh_terms: D000639:Amitriptyline / Q000494:pharmacology*; D000700:Analgesics; D000818:Animals; D001921:Brain / Q000378:metabolism; D002490:Central Nervous System / Q000187:drug effects*; D004347:Drug Interactions; D004361:Drug Tolerance; D008297:Male; D009020:Morphine / Q000378:metabolism / Q000494:pharmacology* / Q000652:urine; D051381:Rats; D011919:Rats, Inbred Strains; D014018:Tissue Distribution
chemical_list: D000700:Analgesics; D000639:Amitriptyline; D009020:Morphine