Antagonism of pethidine by levallorphan in rats.
D000818:Animals; D007977:Levallorphan; D008614:Meperidine / Q000037:antagonists & inhibitors*; D009020:Morphine / Q000037:antagonists & inhibitors*; D051381:Rats
D007977:Levallorphan; D009020:Morphine; D008614:Meperidine
MEPERIDINE/antagonists; MORPHINE/antagonists