[medical citation needed] Common acute side effects are nausea, headaches, increased heart rate and insomnia.

[medical citation needed] 4-FA reacts with reagent testing to give a semi-unique array of colors which can be used to aid its identification.

[10] Regarding the metabolic fate of 4-FA, the C-F bond at the 4-position on the phenyl ring likely resists deactivation in the liver by cytochrome P450 oxidase.

"[14] Neurotoxicity does not increase down the series of para-halogenated amphetamine derivatives, even though serotonin releasing potency does follow this trend.

[25] 4-FA is also controlled in Australia, Belgium, UK, Germany, Israel, Slovakia, Bulgaria, Chile, Brazil, Canada, Croatia, Sweden, New Zealand and France.

[citation needed] Scheduled in the "government decree on narcotic substances, preparations and plants" and is therefore illegal.