title: Pain modulation by adrenergic agents and morphine as measured by three pain tests.
mesh_terms: D000818:Animals; D004347:Drug Interactions; D008297:Male; D008722:Methods; D009020:Morphine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology*; D051381:Rats; D011930:Reaction Time / Q000187:drug effects; D013566:Sympathomimetics / Q000494:pharmacology*; D013997:Time Factors; D015016:Yohimbine / Q000494:pharmacology
chemical_list: D013566:Sympathomimetics; D015016:Yohimbine; D009270:Naloxone; D009020:Morphine