Etonitazepyne is an opioid drug, an analgesic of the benzimidazole class. Etonitazene was developed in the middle of the 20th century and is a type of etonitazene analogue. The opioid potency of Etonitazene is 20 times or more higher than morphine, as shown in rodent testing. Etonitazepyne can be described as a strong pain reliever, euphoric, relaxing, sedative, and hypnotic.