Ammonia cough elicited through a tracheal side tube in unanesthetized dogs:  comparative antitussive bioassay of four morphine derivatives and methadone in terms of ammonia thresholds.
D000641:Ammonia; D000818:Animals; D000996:Antitussive Agents; D001681:Biological Assay; D003371:Cough; D004285:Dogs; D008691:Methadone / Q000494:pharmacology*; D009022:Morphine Derivatives; D012121:Respiration, Artificial
D000996:Antitussive Agents; D009022:Morphine Derivatives; D000641:Ammonia; D008691:Methadone
COUGH/experimental; METHADON/effects; MORPHINE/derivatives