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morphine
(mor´fēn)
the principal and most active opium alkaloid, an opioid analgesic and respiratory depressant, usually used as the sulfate salt and administered orally, parenterally, or rectally. It is used
as an analgesic for relief of severe pain, antitussive, adjunct to anesthesia, and adjunct to treatment of pulmonary edema
caused by left ventricular failure. Its use carries with it the dangers of addiction, as well as tolerance; see drug abuse, drug dependence, and drug tolerance.

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