The effect of levorphan and levallorphan on the respiratory mechanism of normal man.
D019069:Cell Respiration; D007977:Levallorphan; D007981:Levorphanol; D009022:Morphine Derivatives; D012119:Respiration / Q000187:drug effects*
D009022:Morphine Derivatives; D007981:Levorphanol; D007977:Levallorphan
MORPHINE/derivatives; RESPIRATION/effect of drugs on