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Trefentanyl POWDER (A-3665) is an opioid analgesic that is an analogue of fentanyl and was developed in 1992. Buy Trefentanyl Powder.
Trefentanil is most similar to short-acting fentanyl analogues such as alfentanil. In comparative studies, trefentanil was slightly more potent and shorter acting than alfentanil as an analgesic, but induced significantly more severe respiratory depression. For this reason trefentanil has not been adopted for clinical use, although it is still used in research.