3-FA Facts
Stimulant;
Description
3-FA (3-fluoroamphetamine) is a synthetic stimulant of the substituted amphetamine class. It releases dopamine and norepinephrine into the brain's synapses, producing the focused drive and wakefulness characteristic of amphetamine-type stimulants.[1][2]
Subjective effects include wakefulness, concentrated focus, motivation, appetite suppression, and physical stimulation. The experience is purely functional — clean drive without emotional warmth or euphoria, placing it closer to prescription amphetamine than to MDMA.
3-FA carries significant abuse liability — its abuse potential is comparable to methamphetamine[3] — and potent norepinephrine release places serious strain on the heart. Tolerance to the desired effects develops faster than tolerance to cardiac stress, so chasing the effect increases heart risk disproportionately.
Dose and durationby route · individual sensitivity varies
Starts in 20 – 60 minLasts 4 – 6 hoursAfter-effects 2 – 6 hours
Body and dependence
- Acute toxicity
- Moderate
- Chronic toxicity
- Moderate
- Physical dependence
- Moderate
- Psychological dependence
- High
- Withdrawal
- Moderate
- Compulsive redosing
- High
Tolerance
- Builds
- Moderate
- Fully resets after
- 5.5 days
- Carries over to
- amphetamine;
methamphetamine; cocaine; other dopaminergic stimulants
Effectslikely at a common dose
- Perception
- none likely · 5 possible
- Body
- Appetite suppression;
Dry mouth; Insomnia; Pupil dilation; Restlessness; Vasoconstriction; Stimulation; Wakefulness; +19 possible, including Muscle tension, Temperature dysregulation, Excessive sweating - Thinking
- none likely · 16 possible, including Compulsive redosing urge
- Feeling
- Euphoria;
+7 possible, including Anxiety, Dysphoria, Depression - Self
- none likely · 7 possible, including Craving, Ego inflation
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]^Wee S, Anderson KG, Baumann MH, Rothman RB, Blough BE, Woolverton WL (2005) Relationship between the serotonergic activity and reinforcing effects of a series of amphetamine analogs — Journal of Pharmacology and Experimental Therapeutics PMID:15677348
- [2]^Baumann MH, Clark RD, Woolverton WL, Wee S, Blough BE, Rothman RB (2011) In vivo effects of amphetamine analogs reveal evidence for serotonergic inhibition of mesolimbic dopamine transmission in the rat — Journal of Pharmacology and Experimental Therapeutics doi:10.1124/jpet.110.176271
- [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