Cyclopropylfentanyl
Cyclopropylfentanyl is an opioid analgesic that is an analog of fentanyl and has been sold as a designer drug. Between June and December 2017, a total of 78 cyclopropylfentanyl-related deaths with analytical confirmation in post-mortem samples were reported by various European countries. Another 115 deaths involving cyclopropylfentanyl were reported from the United States in 2017.