title: Amitriptyline analgesia: tolerance & cross tolerance pattern.
mesh_terms: D000639:Amitriptyline / Q000494:pharmacology*; D000698:Analgesia; D000700:Analgesics; D000818:Animals; D003000:Clonidine / Q000494:pharmacology; D004361:Drug Tolerance; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology
chemical_list: D000700:Analgesics; D000639:Amitriptyline; D009020:Morphine; D003000:Clonidine