Carfentanil or carfentanyl, sold under the brand name Wildnil, is an extremely potent opioid analgesic used in veterinary medicine to anesthetize large animals such as elephants and rhinoceroses. From Wikipedia
A 39-year-old man died after ingesting counterfeit M30 pills containing carfentanil, a synthetic opioid 10,000 times stronger than morphine.
