DOSINA

Secobarbital

Depressant

A Barbiturate derivative that possesses all the classic effects of todays Benzodiazepines, and the old Barbiturates. It's used in the treatment of Epilepsy, short term treatment for insomnia, and a preoperative medication for anaesthesia and anxiolysis for short surgical/diagnostic/therapeutic procedures.

SecobarbitoneSeconalseconal

Dose and effect data: PsychonautWiki (CC BY-SA 4.0) and TripSit (PolyForm Noncommercial 1.0.0). Less-used substance: fewer independent sources, so treat these numbers with extra caution.

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

Threshold20 mg
Light25–50 mg
Common50–150 mg
Strong150–300 mg

No weight-based model for this substance — published ranges only.

Check an amount you already have

Timeline (oral)

Onset15–60 minutes
Peak240–480 minutes
Offset120–240 minutes
Afterglow60–1440 minutes
Total360–600 minutes

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

Expected effects

  • Heavy sedation
  • Euphoria

Possible side effects

  • Easy to overdose fatally
  • Respiratory depression
  • Severe dependence and withdrawal that can be fatal
  • Dangerous with alcohol

Known toxicity

  • moderate toxicity

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.

Tolerance, dependence and detection

Addiction potentialextremely physically and psychologically addictive
After-effects1-24

Sources

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

• TripSit wiki — Secobarbital (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.