Pethidine and levallorphan; their combined use for premedication.
D000698:Analgesia; D000758:Anesthesia; D000760:Anesthesia and Analgesia; D007977:Levallorphan; D008614:Meperidine; D009020:Morphine / Q000037:antagonists & inhibitors*; D010146:Pain; D059408:Pain Management
D007977:Levallorphan; D009020:Morphine; D008614:Meperidine
ANESTHESIA; MEPERIDINE/anesthesia and analgesia; MORPHINE/antagonists