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Clinical data
Routes of
oral, insufflation
CAS Number
PubChem CID
E number{{#property:P628}}
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Chemical and physical data
Molar mass153.20 g/mol

4-Fluoroamphetamine, para-fluoroamphetamine or 4-fluoro-alpha-methylphenethylamine (4-FMP), is a central nervous system stimulant. It is a chemical analog of amphetamine, and is also related to other phenethylamines, such as cathinone, methcathinone, and methamphetamine.


4-Fluoroamphetamine has a very short history of human use and is very uncommon so therefore little is known about its pharmacological effects, as is the case with many other designer drugs.

4-Fluoroamphetamine clearly has an amphetamine type of effect on the central nervous system. The halogenated compound also shows a mild serotogenic release in the user giving it a very slight resemblance to MDMA, it also differs from other halogenated amphetamines in that it is not known to be as neurotoxic compared with para-chloroamphetamine, para-bromoamphetamine and para-iodoamphetamine. It is noted that the potency of 4-FMP is roughly 2/3 that of dextroamphetamine. 4-FMP when insufflated tends to numb the nasal cavity and can be extremely painful, this way of administration should be avoided. It is suggested that this compound does not have the harsh come down like other CNS stimulants.

Effects include euphoria, increased energy, mood elevation, excessive talking, bruxism (jaw clenching) and suppressed appitite. It also inhibits the ability to sleep, like most stimulants.