DOSINA

4-FA

Stimulant

An empathogen commonly used in place of MDMA, having a similar duration of empathogenic effects. This drug, however, has a longer stimulant "tail," during which effects are more like those of amphetamines. Not to be confused with 4-FMA, which has a similar potency, but is not particularly empathogenic.

4-FMPPAL-303Flux4-Fluoroamphetamine4fa4-fmp4-fluoroamphetamine

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.
⚠This substance has combinations that are life-threatening. Check the Interactions tab before mixing anything.

Dose

Published population range

Threshold40 mg
Light40–100 mg
Common100–130 mg
Strong130–150 mg
Heavy / risk zone≥ 150 mg

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

Check an amount you already have

Timeline (oral)

Onset45–75 minutes
Come-up30–75 minutes
Peak150–210 minutes
Offset120–180 minutes
Afterglow360–720 minutes
Total300–480 minutes

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

Expected effects

  • Empathogenic euphoria with stimulant drive
  • Sociability
  • Music enhancement

Possible side effects

  • Headache and cardiovascular events reported
  • Raised blood pressure
  • Insomnia
  • Anxiety
  • Limited safety data

Harm reduction

  • Test your substance. Cocaine, amphetamine and MDMA powders are routinely cut with fentanyl or nitazenes, and stimulant pills are frequently counterfeits.
  • Do not mix stimulants with each other, with alcohol, or with MAOIs, SSRIs or tramadol - the cardiovascular and serotonin risks compound.
  • Watch body temperature. Overheating and dehydration cause more stimulant emergencies than heart attacks do. Take breaks, cool down with water and air, and sip (do not gulp) fluids.
  • Eat and sleep. Sleep deprivation plus stimulants is the standard route into stimulant psychosis.
  • Do not re-dose compulsively. Set a maximum before you start, and give it to someone else to hold you to.
  • Chest pain, severe headache, one-sided weakness, slurred speech or fainting are medical emergencies. Call for help immediately.
  • Nasal use damages the septum and sinuses; chronic use causes permanent damage that does not heal.

Mixing

TramadolDangerous

See interaction notes for details.

aMTDangerous

See interaction notes for details.

MAOIsDangerous

See interaction notes for details.

DXMUnsafe

See interaction notes for details.

PCPUnsafe

See interaction notes for details.

25x-NBOMeUnsafe

See interaction notes for details.

2C-T-xUnsafe

See interaction notes for details.

5-MeO-xxTUnsafe

See interaction notes for details.

DOxUnsafe

See interaction notes for details.

AlcoholCaution

See interaction notes for details.

GHBCaution

See interaction notes for details.

OpioidsCaution

See interaction notes for details.

Tolerance, dependence and detection

Tolerancehalf tolerance after 3 - 7 days; back to baseline after 1 - 2 weeks
Addiction potentialmoderately addictive with a high potential for abuse
After-effects1-24

Sources

• PsychonautWiki — 4-FA (CC BY-SA 4.0)
https://psychonautwiki.org/wiki/4-FA

• TripSit wiki — 4-FA (PolyForm Noncommercial)
https://wiki.tripsit.me

• Erowid experience reports (external)
https://www.erowid.org/experiences/subs/exp_4Fluoroamphetamine.shtml

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.