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    ๐Ÿงช This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.

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

    Aliases: 4-meppp, 4-mฮฑppp, bk-mbdp, bk-methyl-k, mppp

    Summary

    A stimulant, empathogen and substituted cathinone. It was first synthesised in the 1960s, and re-appeared on the research chemical scene in 2010. Still, very little is known about the pharmacology or effects of this compound.

    Dose Information TripSit

    ROA Light Common Strong Heavy
    Oral 10-20mg 20-40mg 40-80mg 80mg+
    Light Common Strong Heavy

    Onset, Duration & After-effects TripSit

    ROA Onset Peak Offset After Effects Total
    Oral 20-40 min 3-4 hrs - 1-6 hrs 3-4 hrs
    Insufflated 1-5 min 30 min 1-2 hrs 4-12 hrs 3-4 hrs
    Rectal 5-15 min 30 min 1-2 hrs 4-12 hrs 3-4 hrs

    Effect Profile

    5 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

    Stimulant 6.5
    Strong 6/10

    Strong euphoria and anxiety/jitters with moderate focus and stimulation

    Stimulation / Energy ×3
    6
    stimulation wakefulness alertness enhancement
    Euphoria / Mood Lift ×2
    10
    physical euphoria euphoria cognitive euphoria motivation enhancement
    Focus / Productivity ×2
    7
    focus enhancement motivation enhancement thought acceleration
    Anxiety / Jitters ×1
    10
    anxiety increased heart rate teeth grinding vasoconstriction
    Based on reports from:

    Add to PsychonautWiki Journal

    The PsychonautWiki Journal logging app doesn't include every substance. To track Pentylone 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 "Pentylone (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
    Pentylone
    Unit
    mg
    Description
    Pentylone
    Source: SubstanceSearch (substancesearch.com)
    
    Oral dose (mg): light 10-20 ยท common 20-40 ยท strong 40-80 ยท heavy 80+
    Insufflated dose (mg): threshold 5
    Rectal dose (mg): threshold 5
    
    Oral duration: onset 20-40m ยท peak 3-4h ยท total 3-4h ยท after-effects 1-6h
    Insufflated duration: onset 1-5m ยท peak 30m ยท offset 1-2h ยท total 3-4h ยท after-effects 4-12h
    Rectal duration: onset 5-15m ยท peak 30m ยท offset 1-2h ยท total 3-4h ยท after-effects 4-12h
    
    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 ~ 30 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 rapidly, often within a single session; compulsive redosing common
    Reset a few days for acute tolerance

    Tolerance Decay

    Full tolerance 1h Half tolerance 4d Baseline ~5d

    Effects Erowid

    Aggregated from 5 Erowid experience reports

    Positive Effects 2

    Euphoria 80.0% 70%
    Stimulation 60.0% 70%

    Adverse Effects 1

    Anxiety 80.0% 70%

    Combinations TripSit

    Cross-Check Pentylone with another substance

    Community Trip Reports

    Anecdotal first-person accounts from Reddit, Erowid, and Bluelight. Click a source to expand. Reports are harm-reduction context, not medical guidance. Tags summarise each author's own verdict — how reports are classified.

    Erowid 5 reports 2 positive 1 neutral 2 cautionary visit
    A Wonderful Substance positive exp #96666

    Pentylone, overall, has become my drug of choice,having tried all the classic mainstream - including - hard drugs (heroin, meth, etc). It is a very unique and interesting compound.

    pentypolly
    Light and Clear positive exp #112779

    Last year I made an order for some insanely cheap Chinese chemicals, mostly mescaline deritivatives. After 6 months of waiting for them to be synthed (it's pretty shady to take someone's money when you don't in fact even have the substances synthed yet...

    Xorkoth · repeated insufflated / oral / oral / oral
    Worth a Second Look neutral exp #93598

    So in my search to find a rc equally as amazing as methylone I've come accross pentylone and this is what I experianced. I started my night at 9pm with a rediculously low dose of 10mg taken orally.

    vanitykills · bk-MBDP (Pentylone) · 10 mg oral / 10 mg insufflated / 20 mg insufflated / 30 mg oral
    Nothing Special cautionary exp #105745

    Sourced a small amount of this substance as it is still uncontrolled as of writing this. It came as a fluffy white and slightly cakey powder that is very difficult to handle due to it absorbing so much static electricity. It was about 100mg that was insufflated nasally over the course of about 3 hours.

    nobody · repeated insufflated
    Potent and Possibly Dangerous cautionary exp #93856

    I'm writing this one mainly as a warning because I see a lot of bad potential, especially since it has a similar name to methylone which is now banned in the US and some are looking for replacements. I can promise you this is nothing at all like methylone (M1).

    Adams · bk-MBDP (Pentylone) · insufflated
    Bluelight 7 threads 7 neutral visit
    Pentylone 1st Three Trials Retrospective Light And Clear neutral

    Last year I made an order for some insanely cheap Chinese chemicals, mostly mescaline deritivatives. After 6 months of waiting for them to be synthed (it's pretty shady to take someone's money when you don't in fact even have the substances synthed yet...

    scraped 2026-03-14
    Pentylone 1 2 Gram Second Round This Was A Better Go neutral

    (Sorry, still no mg scale, Santa seemed to miss this house.) Also, I apologize about the title, it was approximately 300 mg ingested, not half a gram. I just had half a gram that was going to play with for that session.

    scraped 2026-03-14
    Substance Purported To Be Pentylone 15 20mg First Time Not Recreational neutral

    Substance was acquired from a vendor who is fairly reputable on a certain forum, but does not have my complete trust due to me having received some impure mdpv from him. Appearance is slightly off white, chalky and powdery, slightly wet. Smells chemically and faintly of lemongrass.

    scraped 2026-03-14
    Pentylone 1 4 Gram First Time Im Not Mad Just Disappointed neutral

    Prior to this experiment, I did an allergy test as I do with all new RC's. ~5-10 mg, nothing bad happened. ROA: Insufflation Other stimulant experiences (excluding caffeine and nicotine) are 4-FA and Butylone.

    scraped 2026-03-14
    Pentylone 10 30mg First Time It Has Potential neutral

    So in my search to find a rc equally as amazing as methylone I've come accross pentylone and this is what I experianced. I started my night at 9pm with a rediculously low dose of 10mg taken oraly.

    scraped 2026-03-14
    Pentylone Really Surprised Me neutral

    i was use to buying mephedrone or methynol and was told that penthynol is lighter..... that has not been the case for me a .1 for me of mephedrone was a teaser truth be told i could do 2 grams a day..... recently with the law change i opted to try penthynol.....

    scraped 2026-03-14
    Pentylone Constant Redosing Inexperienced neutral

    DISCLAIMER: ALL RCS SHOULD BE TREATED WITH CARE AND YOU SHOULD NOT DO SUCH HIGH DOSES OF RELETIVELY UNKNOWN CHEMS, OR IV THEM IN GENERAL UNLESS YOU ARE EXPERIENCED IN THE AREA. KNOW YOUR BODY AND KNOW YOUR MIND. So so where to begin. I'm glad I am still high to right this otherwise it would never have happened.

    scraped 2026-03-14

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