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Butyrfentanyl or butyrylfentanyl is a potent short-acting synthetic opioid analgesic drug.  It is an analog of fentanyl with around one quarter of its potency.     This document also states that the article describing its clinical effects and in vitro measures of drug efficacy, antinociceptive, and narcotic properties) . It is an agonist for the μ-opioid receptors.

Butyrfentanyl has no current legitimate clinical applications. However, it is selling as designer drug.

Side effects of fentanyl analogs  which include itching, nausea, and potentially serious respiratory depression which can be life-threatening. Fentanyl analogs have killed hundreds of people throughout Europe and the former Soviet republics since the most recent resurgence in use began in Estonia in the early 2000s, and novel derivatives continue to appear.

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Consequently, Butyrfentanyl binds to the opioid receptor. During the studies of in vitro inhibition of specific [3H] fentanyl binding to the opioid receptor, the order of analogues was: (±)-cis-3-methylfentanyl > fentanyl = alpha-methylfentanyl > butyrylfentanyl > benzylfentanyl.[2] The studies in inhibition studies on binding affinity achieved the same order of analogues. It means that butyrfentantyl is a less potent opioid-agonist than fentanyl. On the other side, during in vitro studies of cross-reactivity with the fentanyl antibody . Fentanyl and the fentanyl analogs examine.   High cross-reactivity may be the effect of the shape of the molecule. The shape of butyrfentanyl is closest to the original fentanyl molecule.

The opioid receptor affinity of fentanyl and its analogs was determined from their inhibitory potency in a binding assay with [3H] fentanyl as the radioligand. The Ki value for butyrfentanyl was Ki=32 ± 4.1 nM. Comparing to fentanyl’s Ki (Ki=1.06 ± 0.15 nM), butyrfentanyl’s ability to displace [3H] fentanyl is low and it requires high concentrations of the drug