Racemorphan, dextromethorphan and respiratory tract fluid.
D001826:Body Fluids; D003915:Dextromethorphan; D006801:Humans; D007287:Inorganic Chemicals; D009022:Morphine Derivatives; D012143:Respiratory Physiological Phenomena; D012137:Respiratory System / Q000502:physiology*
D007287:Inorganic Chemicals; D009022:Morphine Derivatives; D003915:Dextromethorphan
MORPHINE/derivatives; RESPIRATORY TRACT/physiology