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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.

    W-15 Encyclopedic
    Encyclopedic
    Typical encyclopedia coverage. Cross-reference for important decisions.
    • 2 corroborating sources
    • 1 ROA with full dose ladder
    • duration data present
    • 19 combo interactions documented
    • classified Tentative
    • classified Research-chemical

    Depressant Research-chemical Opioid

    Summary TripSit

    A potent opioid that is 5.4x more potent than Morphine. Has a distinct structure unrelated to nearly all other opioid compounds.

    Dose Information TripSit

    ROA Light Common Strong Heavy
    Oral 2-5mg 5-10mg 10-15mg 15mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TripSit

    ROA Onset Peak After Effects Total
    Oral 15-40 min 4-6 hrs 2-4 hrs 4-6 hrs

    Effect Profile

    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 5.0
    Moderate+ 5/10

    Moderate euphoria and itching/nausea with mild pain relief, low sedation

    Euphoria / Warmth ×3
    7
    euphoria cognitive euphoria mood lift
    Analgesia ×2
    4
    analgesia
    Sedation / Relaxation ×1
    3
    sedation
    ⚠ Itching / Nausea ×1
    7
    nausea constipation dry mouth
    View methodology →

    Add to PsychonautWiki Journal

    The PsychonautWiki Journal logging app doesn't include every substance. To track W-15 there, start adding an ingestion, search for the name, and choose to add it as a custom substance. Paste these values:

    ⬇ Download import file Import this file as custom substances and you get "W-15 (Substance Search)" with every route's full dose ladder and timeline, no typing. Works on iOS and Android (v15+); the format is confirmed by the app's developer. The manual values below work for older versions.
    Name
    W-15
    Unit
    mg
    Description 
    W-15
Source: SubstanceSearch (substancesearch.com)

Oral dose (mg): light 2-5 · common 5-10 · strong 10-15 · heavy 15+

Oral duration: onset 15-40m · peak 4-6h · total 4-6h · after-effects 2-4h

Note: ranges are harm-reduction guidance, not a prescription. Start low, go slow, and test your substances.

    Tip: for quicker logging you can also add a Custom Unit in the app, e.g. common dose ~ 7.5 mg (Oral).

    The app keeps custom substances simple, so the full dose ranges live in the description text above. Ranges are harm-reduction guidance, not a prescription.

    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 TripSit

    Positive
    • Analgesia
    • Stimulation
    Negative
    • Dry Mouth
    • Increased heart rate
    • Nausea
    Neutral
    • Itchiness
    • Relaxant
    • Pupil constriction
    • Sedation
    Positive
    • Euphoria
    • Mood lift
    • Reduced anxiety
    • Cognitive euphoria
    • Wakefulness
    Negative
    • Constipation
    • Anxiety
    • Confusion
    • Compulsive redosing
    Neutral
    • Time distortion
    Positive
    • Increased music appreciation
    • Color enhancement
    • Tactile enhancement
    • Brightened colour
    Negative
    • Light sensitivity
    • Appetite suppression
    • Dehydration
    • Disinhibition
    Neutral
    • Dulled perception
    • Drifting

    Combinations TripSit

    Cross-Check W-15 with another substance

    W-15's nerd page Pharmacology, chemical data, effect profiles, and more
    →

    Helpful Links

    📘 Experience Reports 📖 TripSit 📖 PsychonautWiki