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4-Fluoroamphetamine (also known as 4-FA, 4-FMP, para-Fluoroamphetamine, PAL-303 and colloquially as Flux) is a synthetic substituted amphetamine compound that produces a unique progressive mixture of entactogenic and stimulant effects when administered. It is part of a series of fluorinated amphetamine analog that initially included such compounds as 2-FA, 2-FMA, and 3-FA.

Subjective effects of 4-FA as having a moderate MDMA-like entactogenic onset for the initial few hours of the experience that then gradually transitions into traditional amphetamine-type stimulation (for a total duration of around 6 to 8 hours) with residual effects that can last a few hours afterward.

It is commonly reported that the first three to four hours of 4-FA present distinct entactogenic effects that have been reported as feeling somewhat similar to MDMA although not quite as powerful. This is thought to correlate with the duration in which it is promoting the release of serotonin (in addition to dopamine and norepinephrine).

Physical effects
Spontaneous bodily sensations
Physical euphoria – This effect is extremely intense when compared to its physical stimulation.
Tactile enhancement
Bodily control enhancement
Stamina enhancement
Temperature regulation suppression
Increased bodily temperature
Abnormal heartbeat
Increased heart rate
Increased blood pressure
Vibrating vision

4-FA is sold for research purposes only and is not be utilized for any other purposes