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 its effects generally last under two hours. Medically, it is used by injection, nasal spray, skin patch, or absorbed through the cheek as a lozenge or tablet
