Fentanyl (also known as Phentanyl, Fentanil, Fentanest, Fentora, Duragesic, Durogesic, Fentanila, Fentanylum, Sentonil or Sublimase) is a opioid substance of the piperidine class.
Chemistry
Fentanyl is typically found in the form of its citrate and hydrochloride salts.