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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.

    4-Fluorobutyrfentanyl

    Aliases: Pfbf, 4-fbf, parafluorobutyrfentanyl

    Categories

    Depressant Research-chemical Opioid
    4-Fluorobutyrfentanyl structure

    Summary TripSit

    Rare, little known and extremely potent RC analogue of Fentanyl. This powerful opioid is generally only dispensed as a nasal spray. Handle with extreme caution and never mix with other depressants.

    Dose Information TripSit

    ROA Light Common Strong Heavy
    Oral 300ug 600-900ug 900-1200ug 1200ug+
    Light Common Strong Heavy

    Onset, Duration & After-effects TripSit

    ROA Peak Total
    Oral 30-60 min 1800-0 min

    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

    Effects TripSit

    Positive
    • Analgesia
    • Stimulation
    • Physical euphoria
    Negative
    • Dry Mouth
    • Increased heart rate
    • Nausea
    Neutral
    • Itchiness
    • Relaxant
    • Pupil constriction
    • Sedation
    Positive
    • Euphoria
    • Mood lift
    • Reduced anxiety
    • Cognitive euphoria
    • Anxiety suppression
    Negative
    • Constipation
    • Compulsive redosing
    • Anxiety
    • Thought deceleration
    • Amnesia
    Positive
    • Increased music appreciation
    • Increased libido
    • Tactile enhancement
    • Color enhancement
    Negative
    • Disinhibition
    • Light sensitivity
    • Appetite suppression
    • Dehydration
    • Double vision
    Neutral
    • Dulled perception

    Combinations TripSit

    Helpful Links

    📘 Experience Reports 📖 TripSit 📖 PsychonautWiki