What is Fentanyl? Fentanyl is a potent synthetic opioid drug approved by the Food and Drug Administration for use as an analgesic (pain relief) and anesthetic. It is approximately 100 times more potent than morphine and 50 times more potent than heroin as an analgesic. How is it abused? Injected, snorted/sniffed, smoked, taken orally by [...]