I have been a long term user of opiates and am currently on 70mg of methadone daily. Since I started this stage of treatment at 90mg I have been coming down 5mg every month but I'm in no rush to come off it.
Butyrfentanyl
Encyclopedic
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 2 corroborating sources
- 1 ROA with full dose ladder
- duration data present
- 19 combo interactions documented
- classified Tentative
- classified Research-chemical
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 2 corroborating sources
- 1 ROA with full dose ladder
- duration data present
- 19 combo interactions documented
- classified Tentative
- classified Research-chemical
Aliases: B-f, bf
Summary
Potent short-acting opioid and fentanyl analogue. Often dispensed in a nasal spray. This is an highly potent drug - exercise extreme caution.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 400-800ug | 800-1500ug | 1.5-3mg | 3mg+ |
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Peak |
|---|---|---|
| Oral | 15-30 min | 3-4 hrs |
Effect Profile
1 reportsScores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Opioid
3.9
Moderate
4/10
Moderate euphoria with mild itching/nausea, low sedation
Euphoria / Warmth
×3
6
euphoria
cognitive euphoria
Analgesia
×2
0
Sedation / Relaxation
×1
3
sedation
Itching / Nausea
×1
4
nausea
Based on reports from:
Add to PsychonautWiki Journal
The PsychonautWiki Journal logging app doesn't include every substance. To track Butyrfentanyl there, start adding an ingestion, search for the name, and choose to add it as a custom substance. Paste these values:
⬇ Download import file
Import this file as custom substances
and you get "Butyrfentanyl (Substance Search)" with every
route's full dose ladder and timeline, no typing. Works on iOS and
Android (v15+); the format is confirmed by the app's
developer. The manual values below work for older
versions.
Name
Butyrfentanyl
Unit
µg
Description
Butyrfentanyl Source: SubstanceSearch (substancesearch.com) Oral dose (µg): light 400-800ug · common 800-1500ug · strong 1.5-3mg · heavy 3mg+ Oral duration: onset 15-30m · peak 3-4h · after-effects 1-4h Note: ranges are harm-reduction guidance, not a prescription. Start low, go slow, and test your substances.
Tip: for quicker logging you can also add a Custom Unit in the app, e.g. common dose ~ 1150 µg (Oral).
The app keeps custom substances simple, so the full dose ranges live in the description text above. Ranges are harm-reduction guidance, not a prescription.
Tolerance
Build-up
develops within days of regular use; analgesic tolerance faster than respiratory depression tolerance
Reset
7–14 days for partial reset; full reset may take weeks — tolerance loss greatly increases overdose risk
Tolerance Decay
Full tolerance
1d
Half tolerance
21d
Baseline
~35d
Acute tolerance: develops within a single session — the reset numbers above apply after sustained heavy use, not after one binge. Within-session tachyphylaxis usually resets largely overnight.
Effects
Positive
- Stimulation
Negative
- Motor impairment
- Increased heart rate
- Insomnia
- Nausea
- Vasoconstriction
- Restlessness
- Sedation
- Decreased appetite
Positive
- Reduced anxiety
- Euphoria
- Cognitive euphoria
- Wakefulness
- Empathy
Negative
- Anxiety
- Confusion
- Compulsive redosing
- Time distortion
- Talkativeness
Positive
- Increased music appreciation
- Color enhancement
- Brightened colour
- Tactile enhancement
Negative
- Light sensitivity
- Disinhibition
- Appetite suppression
- Dehydration
- Dulled perception
- Drifting
Combinations
Cross-Check Butyrfentanyl with another substanceCommunity Trip Reports
Anecdotal first-person accounts from Reddit, Erowid, and Bluelight. Click a source to expand. Reports are harm-reduction context, not medical guidance. Tags summarise each author's own verdict — how reports are classified.
Erowid 1 report 1 neutral visit
Bluelight 1 thread 1 neutral visit
I have tried to keep this report as objective as possible, please think very carefully before obtaining/consuming this substance. It is very compulsive, especially when smoked. Tolerance rises quickly and will carry over to other opioids.
Butyrfentanyl's nerd page
Pharmacology, chemical data, effect profiles, and more
→
Helpful Links
Report an issue or suggest an edit
Spotted incorrect or dangerous information, have a correction, a new study, or a useful addition for Butyrfentanyl? Let us know. Reports are reviewed by moderators — this is not posted publicly.