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4-Fluoroamphetamine buy, 4FMA , 4-Fluoromethamphetamine (abbreviated 4-FMA) is a synthetic substituted amphetamine with stimulant, entactogenic and purported nootropic effects. Many users describe it subjectively as displaying properties and effects somewhere in spectrum between 4-FA and 2-FMA, but with subtle variations in its pharmacodynamics, kinetics and side effect profile that make it less desirable than either.

4FMA is rarely found on the street and is usually sold as a rare grey area research chemical through online vendors, occasionally along with related designer stimulants such as 2-fluoroamphetamine (2-FA), 3-fluoroamphetamine (3-FA) and 4-fluoroamphetamine buy  (4-FA). Of these, it is one of the least potent and popular fluorinated designer amphetamine in the series.