<unk> , sold under the brand names Dsuvia and<unk> enta, is a synthetic opioid analgesic drug approximately 5 to 10 times as potent as its parent drug, fentanyl, and 500 times as potent as morphine. Structurally,<unk>  differs from fentanyl through the addition of a methoxymethyl group on the piperidine ring (which increases potency but is believed to reduce duration of action), and the replacement of the phenyl ring by thiophene.<unk>  first was synthesized at Janssen Pharmaceutica in 1974.<unk>  is marketed for use by specialist centers under different trade names, such as<unk> enta and<unk> entil.<unk>  with and without lidocaine or mepivacaine is available as a transdermal patch similar to Duragesic in Europe under trade names such as Chronogesic. It is available as a sublingual tablet under the trade name Dsuvia.
Sufentanil
Fentanyl
Nalorphine
Remifentanil
Alfentanil
Betamethadol
Dexmedetomidine
Dezocine