Studies of tolerance development to morphine analgesia in rats tested on the hot plate.
D000315:Adrenalectomy; D000698:Analgesia; D000818:Animals; D004361:Drug Tolerance; D004597:Electroshock; D007977:Levallorphan / Q000494:pharmacology; D008297:Male; D009020:Morphine / Q000037:antagonists & inhibitors; D009269:Nalorphine / Q000494:pharmacology; D051381:Rats; D013997:Time Factors
D007977:Levallorphan; D009020:Morphine; D009269:Nalorphine