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    Disclaimer
    ⚠ Opioids carry significant risk of respiratory depression, physical dependence, and fatal overdose. Never combine with other depressants.

    Pentazocine

    Aliases: Talwin

    Depressant Opioid

    Summary TripSit

    A synthetic opioid used as an analgesic. It is only used IM and IV in the medical field and has respiratory depressant effects. It is pregnancy category C and schedule IV in the US.

    Dose Information TripSit

    ROA Light Common Strong Heavy
    Intramuscular 10-20mg 20mg-30mg 30-60mg 60mg+
    Intravenous 5-10mg 10-20mg 30mg 30mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TripSit

    ROA Onset Peak After Effects
    Intramuscular 15-20 min 2-3 hrs 1-12 hrs
    Intravenous 2-3 min 2-3 hrs 1-12 hrs

    Opioid MME Calculator

    ⚠ Citation & Disclaimer: Conversion factors sourced from the NIH HEAL Initiative MME Calculator (Adams et al., PAIN 2025), the CDC 2022 Clinical Practice Guideline for Prescribing Opioids for Pain, and the MDCalc MME Calculator. These are approximate equianalgesic ratios for educational reference only. Individual responses vary significantly based on genetics, tolerance, cross-tolerance, and route of administration. This is not medical advice. Do not use these conversions to adjust opioid dosing without professional medical guidance.
    mg
    27 mg Pentazocine
    ≈
    — mg Morphine

    ⚠ Equianalgesic dose ratios are approximations and do not account for genetic factors, tolerance, incomplete cross-tolerance, or pharmacokinetic variations. Methadone conversion is especially variable at higher doses. Always consult a healthcare provider before making any changes to opioid therapy.

    Effect Profile

    3 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 5.4
    Moderate+ 5/10

    Strong euphoria with mild sedation and itching/nausea

    Euphoria / Warmth ×3
    9
    physical euphoria cognitive euphoria euphoria
    Analgesia ×2
    0
    Sedation / Relaxation ×1
    5
    sedation muscle relaxation
    ⚠ Itching / Nausea ×1
    4
    nausea
    Based on reports from:
    Erowid Experience Reports PsychonautWiki Pentazocine
    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
    • Physical euphoria
    • Muscle relaxation
    Negative
    • Motor impairment
    • Increased heart rate
    • Nausea
    • Vasoconstriction
    • Respiratory depression
    • Teeth grinding
    Neutral
    • Sedation
    Positive
    • Reduced anxiety
    • Cognitive euphoria
    • Euphoria
    • Anxiety suppression
    • Wakefulness
    Negative
    • Anxiety
    • Compulsive redosing
    • Dizziness
    • Thought deceleration
    Neutral
    • Time distortion
    Positive
    • Increased music appreciation
    • Increased libido
    • Tactile enhancement
    • Color enhancement
    Negative
    • Disinhibition
    • Appetite suppression
    • Dehydration
    • Light sensitivity
    • Double vision
    Neutral
    • Dulled perception

    Combinations TripSit

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

    💊 Pill Identifier 📘 Experience Reports 📖 TripSit 📖 PsychonautWiki