Z4349 is an opioid analgesic drug developed in the 1990s by the pharmaceutical company Zambon. It is a derivative of an older drug viminol, which has been modified to improve potency and metabolic stability. In tests on mice it was found to be several hundred times the potency of morphine. See also 2F-Viminol Desnitroetonitazene References Analgesics Designer drugs Opioids