Mefentanyl
3-Methylfentanyl is an opioid analgesic and is an analog of the potent opioid, fentanyl. 3-Methylfentanyl is one of the most powerful opioid drugs sold illegally and is estimated to be between 400-6000 times more potent than morphine in certain cases. 3-Methylfentanyl was initially discovered in 1974 and widespread illegal use of this drug has occurred since this time.