3-Methylfentanyl (3-MF, mefentanyl) is an opioid analgesic. In its effects, it is analogous to Fentanyl, but is far more potent. 3-Methylfentanyl is 10–15 times more potent than Fentanyl, and several thousand times stronger than Morphine. Side effects of 3-Methylfentanyl are similar to those of fentanyl itself.
3-Methylfentanyl was first discovered in 1974.
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