
Fentanyl is a Schedule II synthetic opioid originally developed to serve as both an analgesic (painkiller) and an anesthetic; however, its strong opioid properties have made it an attractive drug of abuse in the United States. Fentanyl, in its licit form, is diverted from the market on a small scale for personal use or sale. Illicitly manufactured and trafficked fentanyl is responsible for the current domestic crisis. Fentanyl, fentanyl-related compounds, and the precursor chemicals needed to produce these substances originate in China and transit Mexico or Canada enroute to U.S. markets. It is believed that illicit fentanyl manufacturing is occurring in Mexico. Moreover, small-scale production facilities have been discovered in the United States and Canada.