Levorphan in anaesthesia.
D000758:Anesthesia; D000769:Anesthesia, Inhalation; D000776:Anesthesiology; D006801:Humans; D007981:Levorphanol; D009022:Morphine Derivatives
D009022:Morphine Derivatives; D007981:Levorphanol
ANESTHESIA, INHALATION; MORPHINE/derivatives