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Carfentanil or carfentanyl, sold under the brand name Wildnil, is an extremely potent opioid analgesic, around 100 times as potent as its analogue fentanyl. Carfentanyl is used in veterinary medicine to anesthetize large animals such as elephants and rhinoceroses. It is typically administered in this context by tranquilizer dart. Carfentanil has also been used in humans to image opioid receptors. It has additionally been used as a recreational drug, typically by injection, insufflation, or inhalation. Deaths have been reported in association with carfentanil.