koos neuro­leptikumidega operatsioonianalgeesia saavutamiseks kasutatav opiaadide­rivaat, a synthetic opioid narcotic analgesic C22H28N2O with pharmacological action similar to morphine that is administered transdermally as a skin patch and in the form of its citrate C22H28N2O·C6H8O7 is ad, potent, synthetic opioid analgesic with a rapid onset and short duration of action