What Is Fentanyl? Although the medical use of fentanyl has declined recently, illicit fentanyl and its analogs and derivatives have become a significant part of the larger opioid crisis which has spread across the United States and Canada, as well as many other countries. The fentanyl crisis is claiming the lives of hundreds of people each month.What Is Fentanyl? Fentanyl is a high potency synthetic…See More