Source:http://linkedlifedata.com/resource/umls/id/C0023586
MSH: A narcotic analgesic that may be habit-forming. It is nearly as effective orally as by injection.,NCI: A synthetic derivative of morphine with analgesic activities. Levorphanol mimics the actions of morphine, however, it is about 8 times more potent than morphine. This agent binds to opioid mu receptors, thereby producing analgesia, euphoria, sedation, respiratory depression, miosis, bradycardia, and physical dependence.