Carfentanil or carfentanyl, formerly 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.
