Fentanyl is an opioid analgesic, first synthesized in Belgium in the late 1950s, with an analgesic potency of about 80 times that of morphine. It was introduced into medical practice in the 1960s as an intravenous anesthetic under the trade name of Sublimaze. Fentanyl has an LD50 of 3.1 milligrams per kilogram in rats. The LD50 in humans is not known. Fentanyl is a Schedule II drug.
The pharmaceutical industry has developed several analogues of fentanyl:
More on [ Fentanyl ]

DrugDigest: Fentanyl ( Duragesic ) - Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available.
Duragesic - Product information for US health care providers and consumers.
Meta Description: [ DURAGESIC - Prescription medication for relief from moderate to severe chronic pain for up to 72 hours., ]
MedlinePlus: Fentanyl Skin Patches - Features information about dosage, usage, warnings, and side effects.
Meta Description: [ Fentanyl Skin Patches ]
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