The respiratory effects of pethidine and levallorphan.
D007977:Levallorphan; D008614:Meperidine / Q000494:pharmacology*; D009020:Morphine / Q000037:antagonists & inhibitors*; D012119:Respiration / Q000187:drug effects*
D007977:Levallorphan; D009020:Morphine; D008614:Meperidine
MEPERIDINE/effects; MORPHINE/antagonists; RESPIRATION/effect of drugs on