Attenuation of the discriminative stimulus strength of morphine by haloperidol.
D000818:Animals; D004192:Discrimination, Psychological / Q000187:drug effects*; D004347:Drug Interactions; D006220:Haloperidol / Q000494:pharmacology*; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors*; D051381:Rats; D012055:Reinforcement Schedule
D009020:Morphine; D006220:Haloperidol