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    🧪 This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.

    Mebroqualone Encyclopedic
    Encyclopedic
    Typical encyclopedia coverage. Cross-reference for important decisions.
    • 2 corroborating sources
    • 2 ROAs with full dose ladders
    • duration data present
    • classified Tentative
    • classified Research-chemical

    Aliases: Mbq

    Depressant Research-chemical

    Summary TripSit

    A short acting analogue of Methaqualone, that is much more potent.

    Dose Information dose.wiki TripSit

    ROA Light Common Strong Heavy
    Sublingual 5-8mg 8-15mg 15-20mg 20mg+
    Vapourized 3-5mg 5-10mg 10-20mg 20mg+
    Light Common Strong Heavy
    Sources

    Sublingual

    Dose ladder — dose.wiki, TripSit

    Vapourized

    Dose ladder — dose.wiki, TripSit

    Onset, Duration & After-effects TripSit

    ROA Onset Peak After Effects
    Sublingual 5-15 min 45-90 min 1-4 hrs
    Vapourized 1-2 min 20-40 min 1-4 hrs

    Tolerance

    Build-up develops over 1–4 weeks of regular use
    Reset Falls after you stop, at a rate that varies from person to person. If you've been using regularly, cut down gradually with medical help rather than stopping suddenly.

    No tolerance chart. Our decay curves for these drugs were estimates, and a curve can make tolerance look longer-lasting than it is, which is the dangerous direction.

    How fast tolerance to these drugs fades after a break has not been measured well enough to draw, so don't count on a dose you used to take still being safe: after time off, start with a much smaller amount and don't use alone. Mixing sedatives with each other, with alcohol or with opioids sharply raises the risk of a fatal overdose. If you've been using regularly, don't stop suddenly: withdrawal from benzodiazepines, alcohol or GHB/GBL can cause seizures or delirium, so get medical help to cut down gradually.

    Sources: FRANK: benzodiazepines · Alcohol and Drug Foundation: GHB · FDA 2020: benzodiazepine boxed warning · FDA 2019: gabapentinoids and breathing · NHS: alcohol use disorder

    Effects TripSit

    Positive
    Negative
    Neutral
    Positive
    Negative
    Neutral
    Positive
    Negative
    Neutral
    Mebroqualone's nerd page Pharmacology, chemical data, effect profiles, and more
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    Helpful Links

    📖 TripSit 📖 PsychonautWiki
    Add to PsychonautWiki Journal

    The PsychonautWiki Journal logging app doesn't include every substance. To track Mebroqualone 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 "Mebroqualone (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
    Mebroqualone
    Unit
    mg
    Description 
    Mebroqualone
Source: SubstanceSearch (substancesearch.com)

Sublingual dose (mg): threshold 3-5 · light 5-8 · common 8-15 · strong 15-20 · heavy 20+
Vapourized dose (mg): threshold 2-3 · light 3-5 · common 5-10 · strong 10-20 · heavy 20+

Sublingual duration: onset 5-15m · peak 0.75-1.5h · after-effects 1-4h
Vapourized duration: onset 1-2m · peak 20-40m · after-effects 1-4h

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 ~ 11.5 mg (Sublingual).

    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.