etorphine

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e·tor·phine

(et-ōr'fēn),
A narcotic analgesic, with a potency about 1,000 times that of morphine; used in tranquilizer darts.

etorphine

a very potent, semisynthetic analgesic usually used in heavy dosage to avoid side-effects and then reversed with diprenorphine. Used mostly as an immobilizer for free-ranging wild animals, usually in combination with hyoscine and acepromazine.