4-Fluoroamphetamine
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| Pregnancy category | 
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| Routes of administration | By mouth | 
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| Chemical and physical data | |
| Formula | C9H12FN | 
| Molar mass | 153.200 g·mol−1 | 
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4-Fluoroamphetamine (4-FA; 4-FMP; PAL-303; "Flux"), also known as para-fluoroamphetamine (PFA) is a psychoactive research chemical of the phenethylamine and substituted amphetamine chemical classes. It produces stimulant and entactogenic effects. As a recreational drug, 4-FA is sometimes sold along with related compounds such as 2-fluoroamphetamine and 4-fluoromethamphetamine.