Sufentanil has only ever been produced by a German pharmaceutical firm.
== Pharmacology ===== Classification ===Fentanyl is a synthetic opioid in the phenylpiperidine family, which includes sufentanil, alfentanil, remifentanil, and carfentanil
Fentanyl, also spelled fentanil, is a highly potent synthetic opioid used as an analgesic

