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

    Phenomorphan Limited data
    Limited data
    Sparse data. Doses and effects may be unreliable or untested.
    • 1 source
    • no dose data
    • 19 combo interactions documented

    Depressant Opioid

    Summary

    Phenomorphan is a morphinan opioid — the N-phenethyl analogue of levorphanol — and one of the more potent morphinans known: roughly ten times levorphanol, on the order of 60-80 times morphine. It was never marketed and is Schedule I. No human dosing data exists; at this potency a morphine-scale dose is a lethal dose, and no ladder is published here deliberately.

    Effect Profile

    class estimate

    Scores (1–10) curated from multiple sources:

    • Effect keyword matching from PsychonautWiki catalog
    • No reports exist for this substance. Its effect list is the one shared by 12 other substances of the same class, so the scores below describe the class, not this compound.
    • Weighted by importance: core (×3), major (×2), minor (×1)

    Full methodology

    Opioid 5.1
    Moderate+ 5/10

    Strong euphoria with moderate itching/nausea, mild sedation

    Euphoria / Warmth ×3
    9
    physical euphoria cognitive euphoria euphoria
    Analgesia ×2
    0
    Sedation / Relaxation ×1
    5
    sedation muscle relaxation
    ⚠ Itching / Nausea ×1
    6
    nausea constipation
    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
    • Physical euphoria
    • Muscle relaxation
    • Anxiolytic
    Negative
    • Motor impairment
    • Nausea
    • Respiratory depression
    Neutral
    • Sedation
    • Sedative
    • Dystaxia
    • Itchiness
    Positive
    • Reduced anxiety
    • Anxiety suppression
    • Cognitive euphoria
    • Euphoria
    Negative
    • Dizziness
    • Compulsive redosing
    • Thought deceleration
    • Amnesia
    • Motor control loss
    • Constipation
    Positive
    • Increased music appreciation
    • Increased libido
    Negative
    • Disinhibition
    • Appetite suppression
    • Dehydration
    • Light sensitivity
    • Double vision
    • Acuity suppression
    Neutral
    • Dulled perception
    • Internal hallucinations

    Combinations

    Cross-Check Phenomorphan with another substance

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

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