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Acetylfentanyl is a fentanyl analog and a very potent synthetic opioid, similar in structure to fentanyl but with its own risk profile. It works by strongly activating the mu-opioid receptor, producing pain relief, euphoria and heavy sedation, along with dangerous slowing of breathing. It has appeared repeatedly in the illicit drug supply and in overdose deaths; naloxone reverses its effects.
- Strong pain relief
- Euphoria
- Sedation
- Dangerous respiratory depression
- High overdose risk from potency
- Dependence and withdrawal
Mechanism
Acetylfentanyl is a full at the mu-opioid receptor, the target responsible for opioid analgesia, euphoria, sedation and respiratory depression. Like fentanyl it is far more potent than morphine, so it produces strong effects at small quantities; the same potency is what makes overdose easy. The mu-opioid naloxone competitively displaces it and can reverse an overdose.
receptor fingerprint
Mu-opioid receptorFull agonist
Safetyrisks and cautions, not medical advice
Acetylfentanyl's high potency makes overdose easy, and the core danger is respiratory depression, breathing that slows or stops. It is frequently found mixed into or sold as heroin and counterfeit pills, so people take it without knowing, and doses are impossible to judge by eye. It is deadly combined with other depressants such as benzodiazepines and alcohol. Naloxone can reverse an overdose but repeat doses may be needed. Not medical advice.
Subjective profileweighing the evidence above
A synthetic opioid potent enough that a fatal dose is invisible by eye, and it usually turns up in a supply where nobody chose it. There is no safe way to use this; the practical advice is drug checking, naloxone within reach, and never using alone.
Resources
No suppliers are provided for compounds like this. This entry is here for reference.
Research
- 1.Influence of carbon side chain length on the in vivo pharmacokinetic and pharmacodynamic characteristics of illicitly manufactured fentanyls
- 2.Analytical Approaches in Fatal Intoxication Cases Involving New Synthetic Opioids
2 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
How does acetylfentanyl compare to fentanyl?
It is a close fentanyl analog and, like fentanyl, is a very potent mu-opioid agonist far stronger than morphine, with the same high overdose risk.
Does naloxone work on it?
Yes. Naloxone is a mu-opioid antagonist that can reverse an opioid overdose, though more than one dose may be needed for potent opioids.
Why is it so dangerous in street drugs?
It is highly potent and often mixed into heroin or pressed into fake pills, so people unknowingly take a lethal amount.
Adverse effects
- Dangerous respiratory depression
- High overdose risk from potency
- Dependence and withdrawal
Notes and cautions
- Found unpredictably in the drug supply