DOSINA

Phenibut

Depressant

A gabapentinoid-like depressant with a long, slow onset. Dependence forms quickly on daily use, and withdrawal brings severe anxiety and insomnia. The 3+ hour onset is the usual reason people re-dose into a bad experience.

FenibutPhenybutPhGABA

Dose and effect data: PsychonautWiki (CC BY-SA 4.0) and TripSit (PolyForm Noncommercial 1.0.0).

Before you dose

⚠This substance's dose is not reliably weight-scaled - the ranges shown are population figures. Sensitivity varies far more between people than body mass explains.

Dose

Published population range

Threshold0.25 g
Light0.5–1 g
Common1–2 g
Strong2–3.5 g
Heavy / risk zone≥ 3.5 g

Dependence forms within weeks of daily use and withdrawal causes severe anxiety and insomnia.

Check an amount you already have

Timeline (oral)

Onset90–180 minutes
Come-up90–180 minutes
Peak180–240 minutes
Offset240–360 minutes
Afterglow360–1440 minutes
Total600–960 minutes

Bars show relative time in each phase, scaled to the total duration. Each phase keeps its colour in the list above.

Expected effects

  • Relaxation and anxiolysis
  • Sociability
  • Mild euphoria
  • Improved sleep

Possible side effects

  • Onset takes 2-4 hours, so people re-dose too early
  • Dependence within weeks of daily use
  • Withdrawal with severe anxiety, insomnia and in some cases psychosis
  • Sedation
  • Tolerance

Known toxicity

  • low toxicity
  • potentially lethal when mixed with depressants like alcohol, benzodiazepines or opioids

Harm reduction

  • Depressants are the class where mixing kills most often: alcohol, benzodiazepines, GHB/GBL and opioids all suppress breathing when combined.
  • Never use alone. If you use alone, set up a check-in call with someone who will call emergency services if you do not answer.
  • Measure liquid doses with a syringe. Bottle caps, teaspoons and 'glugs' are how people take ten times the intended dose.
  • Sedation can be delayed. Do not re-dose before you can feel the previous dose fully.
  • Do not stop daily benzodiazepine or alcohol use abruptly - withdrawal can cause seizures and is potentially fatal. Taper with medical help.
  • Signs that someone needs emergency help: breathing slower than one breath every 4-5 seconds, blue lips, snoring that will not stop, unrousable, vomiting while unconscious.

Identify what you have

Marquisfoaming (254)
Meckefoaming (221)
Mandelin (reacts)short reddish (234)
Liebermann (reacts)orange (89)
Froehdefoaming (241)
Gallicfoaming (212)

Reagent tests show what a substance probably is, not how pure it is or what else is in the mix. Fentanyl and nitazene test strips are the only reliable check for those, and quantitative lab testing is better than both.

Tolerance, dependence and detection

Toleranceback to baseline after 7 - 14 days
Addiction potentialmoderately physically and psychologically addictive
After-effects1-24

Sources

• PsychonautWiki — Phenibut (CC BY-SA 4.0)
https://psychonautwiki.org/wiki/Phenibut

• TripSit wiki — Phenibut (PolyForm Noncommercial)
https://wiki.tripsit.me

Dosina is educational harm-reduction information, not medical advice. Doses are population ranges from published sources and cannot account for your tolerance, health conditions or what is actually in your substance. Possession and use may be illegal where you live.