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:
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
- Pupil dilation
- 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.
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.
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