Carfentanil (also known as Carfentanyl; 4-carbomethoxyfentanyl; R33799) is an analog of the synthetic opioid analgesic Fentanyl. Carfentanil was first synthesized in 1974 by a team of chemists at Janssen Pharmaceutica which included Paul Janssen.
The effect of Carfentanil exceeds Fentanyl and Morphine in 100 and 10000 times, respectively. Median analgesic activity of ED50 for Carfentanil with intravenous administration to rats is 0.41 μg / kg, the effect on the human body begins already with 1 μg.
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