Cyclopentylfentanyl is an opioid analgesic that is an analog of fentanyl. Seems to be less potent than its former being Acetyl-Fentanyl.

Cyclopentylfentanyl:

• An opioid analgesic
• An analog of fentanyl
• Has been sold online as a designer drug mainly in Sweden and other Scandinavian countries

Side effects of fentanyl analogs are similar to those of fentanyl itself which include itching, nausea and potentially serious respiratory depression, which can be life-threatening