2-FMA Facts
Stimulant;
Description
2-FMA (2-fluoromethamphetamine) is a synthetic stimulant of the phenethylamine class. It releases dopamine and norepinephrine from nerve terminals into the synapse,[1][2] producing the focused wakefulness characteristic of amphetamine-type stimulants.
Subjective effects include focus enhancement, wakefulness, motivation, appetite suppression, and increased heart rate. The experience is utilitarian — sustained, directed attention without the rush or compulsive redosing of more recreational stimulants.[3]
Dependence potential is estimated as moderate by analogy to methamphetamine. Cardiovascular stress — elevated blood pressure, rapid heart rate, and vasoconstriction — is the primary physical danger, compounding with repeated use or high doses.[4][5]
Dose and durationby route · individual sensitivity varies
Starts in 30 – 60 minLasts 7 – 9 hoursAfter-effects 4 – 12 hours
Body and dependence
- Acute toxicity
- Moderate
- Chronic toxicity
- Moderate
- Physical dependence
- Moderate
- Psychological dependence
- Moderate
- Withdrawal
- Moderate
- Compulsive redosing
- Low
Tolerance
- Builds
- Moderate
- Fully resets after
- 10.5 days
- Carries over to
- amphetamine;
methamphetamine; other dopaminergic stimulants; other fluorinated amphetamines
Effectslikely at a common dose
- Perception
- none likely · 9 possible
- Body
- Pupil dilation;
Vasoconstriction; Appetite suppression; Stimulation; Wakefulness; Insomnia; +24 possible, including Temperature dysregulation, Excessive sweating, Dehydration sensation - Thinking
- none likely · 21 possible, including Compulsive redosing urge
- Feeling
- none likely · 8 possible, including Anxiety, Depression, Anhedonia
- Self
- none likely · 10 possible, including Ego inflation, Craving, Compulsive repetitive behavior
- Awareness
- One-pointedness (ekaggata);
Sustained attention (vicara); +1 possible
Who shouldn't take it
Combinations61 recorded
Seek help immediately if
- Chest pain; racing, pounding, or irregular heartbeat
- Very high body temperature; heavy sweating; hot, flushed skin
- Severe agitation, paranoia, panic, or confusion
- Severe headache; muscle rigidity or twitching
- Seizures
- Signs of stroke — face drooping, one-sided weakness, slurred speech
- Difficulty breathing; collapse or unconsciousness
What to do
- Call emergency services for chest pain, overheating, seizure, or unresponsiveness
- Move them to a cool, quiet place and reduce stimulation
- Cool the body — remove excess clothing, apply cool damp cloths, fan them
- Keep them calm; reassure — panic worsens the cardiovascular strain
- If seizing, protect from injury (don't restrain); recovery position afterward
- Monitor breathing and be ready to give rescue breaths / CPR
Most stimulant overdoses settle with cooling, a calm environment, and time. The medical danger is hyperthermia, cardiac events (arrhythmia, heart attack, stroke), and seizures — get help immediately if any appear.
988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE
References
- [1]^Simmler LD, Liechti ME (2018) Pharmacology of MDMA- and Amphetamine-Like New Psychoactive Substances — Handbook of Experimental Pharmacology doi:10.1007/164_2018_113
- [2]^Luethi D, Liechti ME (2020) Designer drugs: mechanism of action and adverse effects — Archives of Toxicology doi:10.1007/s00204-020-02693-7
- [3]^Anchondo O, Shetty RA, Gatch MB (2025) Locomotor and discriminative stimulus effects of fluorinated analogs of amphetamine and methamphetamine in mice and rats — Journal of Pharmacology and Experimental Therapeutics doi:10.1016/j.jpet.2025.103617
- [4]^Annawald K, Streckfuss-Bomeke K, Meyer T (2024) Methamphetamine-induced cardiotoxicity: in search of protective transcriptional mechanisms — Herz doi:10.1007/s00059-024-05279-6
- [5]^Schep LJ, Slaughter RJ, Beasley DM (2010) The clinical toxicology of metamfetamine — Clinical Toxicology doi:10.3109/15563650.2010.516752