spec sheet10 rows
4-FMA is methamphetamine with a fluorine at the para (4) position of the ring. Like other fluorinated methamphetamines it raises dopamine and norepinephrine, with some serotonin activity from the para substitution. It is a poorly studied research chemical and carries the usual amphetamine-class risks plus the caution warranted by para-fluoro compounds.
- Wakefulness and energy
- Elevated mood
- Improved focus
- Raised heart rate and blood pressure
- Overheating risk
- Insomnia
Mechanism
4-FMA is a substituted amphetamine that acts as a releasing agent and at the and transporters, with the para-fluoro position adding some -releasing activity. This gives a stimulating profile with a slight serotonergic tint, though it is less pronounced than the primary-amine 4-FA. Its detailed human pharmacology is not well characterized.
receptor fingerprint
transporter (NET)Releaser / reuptake inhibitor
()Releaser / reuptake inhibitor
transporter (SERT)Releaser
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
It raises heart rate and blood pressure, suppresses appetite and sleep, and can drive compulsive redosing and dependence. Its serotonin activity means MAOIs and other serotonergic drugs pose a serotonin-toxicity risk, and para-fluoro amphetamines as a group warrant extra caution about cardiovascular strain. Overheating is a risk in warm, active settings. Not medical advice.
Subjective profileweighing the evidence above
Nothing here justifies picking it over better-characterised stimulants: two citations, anecdotal dosing only, and a para-fluoro structure that adds serotonin activity and overheating risk on top of the usual amphetamine load.
Resources
This entry is here for reference.
Research
- 1.Monoamine transporter and receptor interaction profiles of novel psychoactive substances: para-halogenated amphetamines and pyrovalerone cathinones
- 2.Locomotor and discriminative stimulus effects of fluorinated analogs of amphetamine and methamphetamine in mice and rats
2 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Is 4-FMA the same as 4-FA?
No. 4-FMA is the N-methyl version and is more stimulant-weighted, while 4-FA has a stronger serotonergic, entactogen-like character.
Does it carry a serotonin risk?
Yes, some. Its serotonin release makes MAOIs and other serotonergic drugs a real hazard.
Is it well studied?
No. Human data is sparse, so its safety profile is largely unknown.
Adverse effects
- Raised heart rate and blood pressure
- Overheating risk
- Insomnia
Notes and cautions
- Comedown