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    Disclaimer
    🧪 This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.
    ⚠ Opioids carry significant risk of respiratory depression, physical dependence, and fatal overdose. Never combine with other depressants.

    U-47700

    Aliases: U4, Pink, Pinky, Pink heroin, u47700

    Depressant Research-chemical Opioid

    Summary TheDrug.Wiki TripSit PsychonautWiki

    U-47700 is an extremely dangerous synthetic opioid with approximately 7.5 times the potency of morphine and very little history of human use. It is uniquely caustic to mucous membranes and can cause severe tissue damage with insufflated, sublingual, or smoked administration. A laboratory-grade milligram scale is absolutely essential as sub-milligram differences can mean the difference between an active dose and fatal overdose.

    Dose Information TheDrug.Wiki TripSit PsychonautWiki

    ROA Light Common Strong Heavy
    Oral 5-7.5mg 7.5-15mg 15-25mg 25mg+
    Insufflated 4-6mg 6-8mg 8-10mg 10mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TheDrug.Wiki TripSit PsychonautWiki

    ROA Onset Comeup Peak Offset After Effects
    Oral 10-15 min - 2-3 hrs 2-3 hrs 2-4 hrs
    Insufflated 5-15 min 15-20 min 1-2 hrs 1-2 hrs 2-4 hrs
    Intravenous 0-1 min - 30-60 min 30-60 min 1-3 hrs
    Rectal 10-15 min - 1-2 hrs 1-2 hrs 2-4 hrs

    Effect Profile

    9 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 8.0
    Intense 8/10

    Strong euphoria and pain relief with mild sedation and itching/nausea

    Euphoria / Warmth ×3
    10
    physical euphoria cognitive euphoria euphoria mood lift
    Analgesia ×2
    8
    pain relief analgesia
    Sedation / Relaxation ×1
    4
    sedation dream potentiation
    ⚠ Itching / Nausea ×1
    4
    constipation dry mouth
    Based on reports from:
    Erowid Experience Reports PsychonautWiki U-47700
    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 Erowid

    Aggregated from 9 Erowid experience reports

    Positive Effects 3

    Sedation 44.4% 70%
    Euphoria 44.4% 70%
    Anxiety Suppression 33.3% 70%

    Adverse Effects 0

    Combinations TripSit

    U-47700's nerd page Pharmacology, chemical data, effect profiles, and more
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    Helpful Links

    📘 Experience Reports 📖 TheDrug.Wiki 📖 PsychonautWiki