Fentanyl

Fentanyl is a highly potent synthetic opioid used as an analgesic and sedative. It is 30 to 50 times more potent than heroin and 100 times more potent than morphine, and its primary clinical utility is in pain management for cancer patients and those recovering from painful surgeries. Fentanyl works by activating μ-opioid receptors and can be very fast acting depending on the method of delivery. It has several adverse effects, including addiction, respiratory depression, drowsiness, nausea, and loss of consciousness, and can be fatal in large doses.learn more on wikipedia