Description General description para-Fluorofentanyl is an opioid analgesic being an analogue of fentanyl developed by Janssen Pharmaceutica in the 1960s. para-Fluorofentanyl potently activates the human μ; opioid receptor and is abused recreationally. A certified Snap-N-Spike® solution suitable for use as starting material in calibrators and controls for para-Fluorofentanyl LC/MS or GC/MS testing methods in clinical toxicology, urine drug testing or forensic analysis applications. Legal Information CERILLIANT is a registered trademark of Cerilliant Corporation Snap-N-Spike is a registered trademark of Cerilliant Corporation