Buy Fentanyl 100mcg/2ml injection Online Fentanyl is a highly potent synthetic piperidine opioid primarily used as an analgesic (pain medication). Fentanyl, also spelled fentanil, is a powerful opioid used as a pain medication and together with other medications for anesthesia. It is also used as a recreational drug, sometimes mixed with heroin, methamphetamine, or cocaine. It has a rapid onset and [...]