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    Disclaimer
    ☠ This is a fentanyl analogue active in microgram doses. Accidental overdose can be rapidly fatal. Naloxone should always be on hand.
    🧪 This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.

    Butyrfentanyl

    Aliases: B-f, bf

    Depressant Research-chemical Opioid

    Summary TripSit

    Potent short-acting opioid and fentanyl analogue. Often dispensed in a nasal spray. This is an highly potent drug - exercise extreme caution.

    Dose Information TripSit

    ROA Light Common Strong Heavy
    Oral 400-800ug 800-1500ug 1.5-3mg 3mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TripSit

    ROA Onset Peak After Effects
    Oral 15-30 min 3-4 hrs 1-4 hrs

    Effect Profile

    1 reports

    Scores (1–10) curated from multiple sources:

    • Effect keyword matching from PsychonautWiki catalog
    • Weighted by importance: core (×3), major (×2), minor (×1)

    Full methodology

    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:
    Erowid Experience Reports PsychonautWiki Butyrfentanyl
    View methodology →

    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

    Effects

    Positive
    • Stimulation
    Negative
    • Motor impairment
    • Increased heart rate
    • Pupil dilation
    • Insomnia
    • Nausea
    • Vasoconstriction
    • Restlessness
    Neutral
    • Sedation
    • Decreased appetite
    Positive
    • Reduced anxiety
    • Euphoria
    • Cognitive euphoria
    • Wakefulness
    • Empathy
    Negative
    • Anxiety
    • Confusion
    • Compulsive redosing
    Neutral
    • Time distortion
    • Talkativeness
    Positive
    • Increased music appreciation
    • Color enhancement
    • Brightened colour
    • Tactile enhancement
    Negative
    • Light sensitivity
    • Disinhibition
    • Appetite suppression
    • Dehydration
    Neutral
    • Dulled perception
    • Drifting

    Combinations TripSit

    Butyrfentanyl's nerd page Pharmacology, chemical data, effect profiles, and more
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    Helpful Links

    📘 Experience Reports 📖 TripSit 📖 PsychonautWiki