Acetyl fentanyl (acetyl Fentanyl) is an opioid-based analgesic medication that acts as an analog to Fentanyl. Likewise, research has shown that acetyl fentanyl can be 15 times more powerful than morphine. That means that, although it is a little weaker than fentanyl it is nevertheless a significant amount stronger than pure heroin. It has not been license for medical use and is sold as a designer drug. Acetyl fentanyl was discover in the same period as fentanyl itself and was only discover on the market for illicit drugs in the latter half of the 1980s. In the year 2013, Canadian officers seized three kilograms of Acetyl fentanyl. It is a m-opioid receptor antagonist Acetylfentanyl could be an effective substitute for heroin and other opioids. The most common side effects associated with Fentanyl analogs are comparable to those experienced by fentanyl that includes nausea, itching, and possibly severe respiratory depression that could be life-threatening. Fentanyl derivatives killed a number of people across Europe and in the former Soviet republics in the last few years, since the latest resurgence in their use started within Estonia in the mid-2000s new derivatives are still appearing. Acetyl Fentanyl Powder For Sale.