Benzylfentanyl
Limited data
Limited data
Sparse data. Doses and effects may be unreliable or untested.
- 1 source
- no dose data
- 29 combo interactions documented
- 1 source
- no dose data
- 29 combo interactions documented
Summary
Benzylfentanyl is a precursor used in the synthesis of fentanyl, not a recreational opioid. It is essentially inactive at the μ-opioid receptor. The DEA removed it from Schedule I in 2010 after concluding it has no significant opioid activity of its own; it remains a List I chemical because of its role in manufacture. There are no established human psychoactive effects. Material sold under this name is far more likely to contain fentanyl itself, or a mixture, than benzylfentanyl.
Effect Profile
class estimateScores (0–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- No reports exist for this substance. Its effect list is the one shared by 1 other substance of the same class, so the scores below describe the class, not this compound.
- Weighted by importance: core (×3), major (×2), minor (×1)
Strong euphoria with moderate itching/nausea, mild sedation
Tolerance
No tolerance chart. Our decay curves for opioids were estimates, and a curve can make tolerance look longer-lasting than it is, which is the dangerous direction.
Opioid tolerance drops fast when you stop, and even a few days off can be enough, so a dose that used to be normal can now stop your breathing. Overdose deaths rise sharply after prison, detox or leaving treatment, and tolerance also falls during a hospital stay. After any break, start with a much smaller amount, try a test dose first, don't use alone, and keep naloxone within reach. Alcohol, benzodiazepines, gabapentinoids and other sedatives make an opioid overdose much more likely.
Sources: FRANK: heroin · National Harm Reduction Coalition · WHO: opioid overdose · Merrall et al. 2010 · Binswanger et al. 2007 · Strang et al. 2003 · FDA 2019: gabapentinoids and breathing
Effects
Effect glossary — · full glossary
Combinations
Cross-Check Benzylfentanyl with another substanceHelpful Links
Report an issue or suggest an edit
Spotted incorrect or dangerous information, have a correction, a new study, or a useful addition for Benzylfentanyl? Let us know. Reports are reviewed by moderators — this is not posted publicly.