title: The effect of pentobarbital on the antinociceptive action of morphine in morphine-tolerant and non-tolerant rats.
mesh_terms: D000818:Animals; D004361:Drug Tolerance; D006801:Humans; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009021:Morphine Dependence / Q000503:physiopathology*; D010146:Pain / Q000503:physiopathology*; D010424:Pentobarbital / Q000494:pharmacology*; D051381:Rats; D012684:Sensory Thresholds / Q000187:drug effects; D013997:Time Factors
chemical_list: D009020:Morphine; D010424:Pentobarbital