What is fentanyl, the opioid drug 50 times stronger than heroin?

What is fentanyl, the opioid drug 50 times stronger than heroin?

Fentanyl is an extremely potent synthetic opioid, typically used as a painkiller. However, in recent years it has been mixed with heroin and other street opioids, leading to an increase in overdoses across the world. Fentanyl is 100 times stronger than street heroin, with some variants such as Carfentanyl thought to be 10,000 times stronger. Aug 2, 2017