Carfentanil or carfentanyl, sold under the brand name Wildnil, is an opioid analgesic which is used in veterinary medicine to anesthetize large animals such as elephants and bears. And, It is typically administered in this context by tranquilizer dart. Furthermore, Carfentanil has also been used in humans for imaging of opioid receptors. Too, It has additionally been encountered as an illicit drug, typically used by injection, insufflation, or inhalation. Deaths have been reported in association with carfentanil.

Effects and side effects of carfentanil in humans are similar to those of other opioids and include euphoria, relaxation, pain relief, pupil constriction, drowsiness, sedation, slowed heart rate, low blood pressure, lowered body temperature, loss of consciousness, and suppression of breathing.

However, The effects of carfentanil, including overdose, can be reversed by the opioid antagonists naloxone and naltrexone, though higher or multiple doses than usual may be necessary compared to other opioids. Carfentanil is a structural analogue of the synthetic opioid analgesic fentanyl. Also, It acts as an ultrapotent and highly selective agonist of the μ-opioid receptor.

Carfentanil was first synthesized in 1974 by a team of chemists at Janssen Pharmaceutica which included Paul Janssen. It was introduced into veterinary medicine in 1986. Carfentanil is legally controlled in most jurisdictions.

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