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The psychoactive research chemical 4-fluoroamphetamine (4-FA; 4-FMP; PAL-303; “Flux”), also referred to as para-fluoroamphetamine (PFA), is a member of the phenethylamine and substituted amphetamine chemical classes. Both stimulant and entactogenic actions are produced. As a recreational substance, 4 FA is sometimes sold along with related compounds such as 2-fluoroamphetamine and 4-fluoromethamphetamine.

4-FA is named 4-Fluoroamphetamine, also known as 4FA 4 Fmp buy; PAL-303, “Flux,” and PFA. It is a member of the chemical classes substituted amphetamine and phenethylamine.

Unlike its analogs, 4-CA and 4-BA, 4-FA does not deplete brain serotonin over an extended period. According to theory, this “reflects the fluoro-compound’s inability to be metabolized in the same way as the other halo amphetamines.

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Subjective effects of 4-FA include:

  • Euphoria (which some compare to MDMA effects).
  • Elevated mood.
  • Warmth and empathy.
  • Increased activity (stimulation).
  • Excessive talking.
  • Bruxism.
  • Reduced hunger (anorexia).

For the first several hours, empathogenic effects are the main course of action, which fade out as increased stimulation develops over the next several hours.

4-FA For Sale

4-Fluoroamphetamine (4-FA) is a synthetic molecule in the amphetamine family. The amphetamine class molecules contain a phenethylamine ring, which has a phenyl ring attached to an amino group (NH2) via an ethyl chain with an additional methyl substitution in Rα. Amphetamines are alpha-methylated phenethylamines. 4-Fluoroamphetamine contains a fluorine atom in R4 of its phenyl ring and is a fluorinated analog of amphetamine.

4-Fluoroamphetamine acts as a releasing agent and reuptake inhibitor for dopamine, serotonin, and norepinephrine, producing amphetamine-like stimulatory effects at lower doses and euphoric effects similar to MDMA at doses greater than 100 mg. 4fa mechanism of action effectively increases the levels of the neurotransmitters norepinephrine, dopamine, and serotonin at higher doses in the brain by binding and partially blocking the transport proteins that normally remove these synaptic cleft-derived monoamines. This permits the brain’s levels of dopamine, norepinephrine, and serotonin to rise, resulting in stimulatory, euphoric, and entactogenic effects.


4-Fluoroamphetamine’s subjective effects include euphoria, which some compare to amphetamine and MDMA, increased energy (stimulation), mood elevation, feelings of warmth and empathy, excessive speech, braces, and anorexia (suppressed appetite). Over the next few hours, there is a gradual development of higher stimulation, although, for the first few hours, the main effects are empathogenic.

4-FA produces a greater dopamine reuptake inhibition than 4-CA or 4-IA combined. Moreover, 4-FA causes less hyperthermia than comparable substances like PMA, 3-MTA, and 4-methylamphetamine.


Chemical Information:

  • Chemical Formula: C9H12FN
  • IUPAC Name: 1-(4-Fluorophenyl)propan-2-amine
  • Molecular Weight: 153.20 g/mol
  • CAS Number: 459-02-9

Physical Properties:

  • Appearance: White crystalline powder
  • Purity: ≥ 99%
  • Solubility: Soluble in water and organic solvents such as ethanol and methanol
  • Melting Point: 147-149°C
  • Boiling Point: 205-206°C at 760 mmHg


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