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2-FA

2-FA molecule structure2-FA molecule structure
2-Fluoroamphetamine
Psychoactive Class
Chemical Class

2-FA is a synthetic stimulant of the substituted amphetamine class, distinguished by a fluorine atom at the 2-position of the amphetamine structure.citation needed It first emerged on the online research chemical market in the 2010s as part of a series of fluorinated amphetamine analogs. Among these, 2-FA is regarded as the most closely resembling conventional amphetamine in its subjective effects and is frequently compared to dextroamphetamine. It is considered habit-forming.

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~5 mg
Light5-15 mg
Moderate15-30 mg
Strong30-50 mg
Heavy50+ mg

Duration

Onset15-30 minutes
Come Up15-30 minutes
Peak1-2 hours
Offset1-1.5 hours
After Effects2-12 hours
Total2-4 hours

Subjective Effects

Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.

The experience is that of a classical stimulant: elevated mood, increased energy and alertness, heightened sociability, and a reduced need for food and sleep. 2-FA is frequently described as a smoother, more functional alternative to amphetamine, with a comparatively clear headspace and a gentler comedown that makes it amenable to productivity-oriented use. Sensory alteration is largely absent at common doses, though visual and auditory hallucinations have been reported, typically in the context of high doses or extended sleep deprivation.

Physical

Physical effects center on stimulation and wakefulness, accompanied by appetite suppression, sweating, jaw tension, and occasional itchiness. Disturbed sleep is common in the hours following use, and repeated use can lead to weight loss.

Uncomfortable

Cognitive

The headspace is energetic and talkative, marked by euphoria, mood lift, and enhanced sociability. As the effects wear off or with repeated use, this can give way to moodiness, irritability, and aggressiveness.

Emotional

The emotional tone is predominantly positive during the experience, with negative shifts more likely during the offset or with repeated use.

Social

Increased libido

Visual

Visual effects are not characteristic of ordinary use; hallucinations are associated with high doses and sleep deprivation.

Auditory

Reagent Testing

Expected colorimetric results for common reagent tests. Colors show reaction change over 1–2 minutes.

Marquis(MQ)
white → yellow2 → brown1
Liebermann(LB)
white → orange2
Mecke(ME)
No reaction
No reaction
Mandelin(MD)
No reaction
No reaction
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Pharmacology

Pharmacodynamics

2-FA has not been formally studied to the same extent as traditional amphetamines. Based on its structural similarity to other substituted amphetamines with comparable substitution patterns, it is thought to act primarily as a dopamine and norepinephrine releasing agent. This would involve binding to and partially blocking the transporter proteins that normally clear dopamine and norepinephrine from the synaptic cleft, allowing these neurotransmitters to accumulate to elevated levels in the brain.citation needed

Pharmacokinetics

There have been no studies on the pharmacokinetic profile of 2-FA and the metabolism of 2-FA is unknown.

Metabolitesnone documented yet

Interactions

Dangerous

Highest risk

These combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.

2C-T-x compounds5-MeO-xxT tryptaminesAMTAlcoholCaffeineCannabisCocaineDOx compoundsDXMKetamineMAOIsMethoxetamineNBOMe compoundsOpioidsPCPTramadol
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Tolerance

Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.

Full Tolerance
With prolonged repeated 2-FA use, many effects may weaken, causing users to need larger amounts for comparable results. 2-FA and 2-FMA have been observed to share cross-tolerance, similar to the relationship between amphetamine and methamphetamine.
Baseline Reset
1-10 days
Half Tolerance
3-7 days
Cross Tolerance

Dopaminergic stimulants, MDMA, because its full euphoric effect depends on dopamine and norepinephrine, 2-FMA

Harm Potential

Addiction & Dependence

Psychological

Moderate

With ongoing use, 2-FA may be moderately addictive and carries a substantial risk of abuse; some users can develop psychological dependence. Compulsive redosing has also been reported, and cravings may occur after sudden discontinuation.

Physical

Low

Withdrawal effects may occur when dependence has developed and use is suddenly stopped, though specific physical withdrawal symptoms are not well characterized for this compound.

Toxicity

Cardiovascular

Acute cardiovascular stimulation including increased heart rate, elevated blood pressure, abnormal heartbeat, and vasoconstriction occurs during intoxication; long-term cardiovascular effects have not been studied in any scientific context.

Psychosis Risk

Abuse of amphetamine-class compounds at high dosages for prolonged periods can result in stimulant psychosis presenting with paranoia, hallucinations, or delusions.citation needed Reviews of amphetamine-induced psychosis indicate that approximately 5-15% of affected users may not fully recover, though antipsychotic medications are effective for acute episodes.1

Seizure Risk

Seizures are listed as a possible adverse effect, though specific incidence data for 2-FA is not available. Risk may be elevated in combination with other seizure-threshold-lowering substances.

History & Culture

2-Fluoroamphetamine emerged on the online research chemical market during the 2010s as part of a broader wave of fluorinated amphetamine derivatives. This family of compounds includes 2-FMA, 3-FA, 3-FEA, and 4-FA, which are positional isomers differing in the placement of the fluorine atom on the

Legality

By Country

Illegal6
Canada flagCanadaSchedule I (by analogue)
China flagChinaIllegal
Finland flagFinlandIllegal
Netherlands flagNetherlandsIllegal
Turkey flagTurkeyIllegal
United Kingdom flagUnited KingdomClass A
Controlled / restricted4
United States flagUnited StatesPotentially Schedule II (by analogue)
Germany flagGermanyControlled (NpSG)
New Zealand flagNew ZealandSchedule 3
Switzerland flagSwitzerlandRestricted
Not scheduled1
France flagFranceNot scheduled (grey area)

References

Source Pages

  1. Bluelight: 2-FA Experienced summary (2010)
  2. Bluelight: 2-FA Mega-thread (2011)
  3. Erowid Experience Vaults: 2-FA
  4. Isomer Design (TiHKAL/PiHKAL)
  5. PsychonautWiki
  6. TripSit Factsheets
  7. TripSit: Drug Combinations Chart
  8. Wikipedia

Citations

  1. Steven J Shoptaw, Uyen Kao, & Walter Ling. (2009). Treatment for amphetamine psychosis. https://doi.org/10.1002/14651858.cd003026.pub31
  2. Controlled Drugs and Substances Act, Schedule I (Amphetamines). (n.d.). https://laws-lois.justice.gc.ca/eng/acts/C-38.8/page-9.html1
  3. 我国管制毒品目录(2026年7月更新,540种+三大类). ga.sz.gov.cn (n.d.). https://ga.sz.gov.cn/SZJDZX/SZBMFW/content/post_12898420.html1
  4. 非药用类麻醉药品和精神药品列管办法. gaj.panjin.gov.cn (n.d.). https://gaj.panjin.gov.cn/2015_10/08_00/content-235605.html1
  5. 三部门联合发布最新版《非药用类麻醉药品和精神药品目录》. btgaj.xjbt.gov.cn (n.d.). https://btgaj.xjbt.gov.cn/c/2025-07-28/8428464.shtml1
  6. 关于将二氟乙咪酯等16种物质列入《非药用类麻醉药品和精神药品目录》的公告. btgaj.xjbt.gov.cn (n.d.). https://btgaj.xjbt.gov.cn/c/2026-06-23/8490261.shtml1
  7. 麻醉药品和精神药品管理条例(2024年12月6日修订版). xzfg.moj.gov.cn (n.d.). https://xzfg.moj.gov.cn/mobile/law/detail?LawID=17441
  8. 中华人民共和国禁毒法. gat.xinjiang.gov.cn (n.d.). https://gat.xinjiang.gov.cn/gat/flfg/201711/45dd941abaf044e18d80aa60bbdd9b89/files/%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%B0%91%E5%85%B1%E5%92%8C%E5%9B%BD%E7%A6%81%E6%AF%92%E6%B3%95.pdf1
  9. 中华人民共和国刑法. audit.gov.cn (n.d.). https://www.audit.gov.cn/n7/n34/n58/c109675/content.html1
  10. 北京市公安局《中华人民共和国治安管理处罚法》行政处罚裁量基准(2026版). beijing.gov.cn (n.d.). https://www.beijing.gov.cn/zhengce/zhengcefagui/202606/t20260622_4709382.html1

Further Reading

  1. Cayman Chemical - 2-Fluoroamphetamine datasheet
  2. Cayman Chemical – 2-Fluoroamphetamine datasheet
  3. Discrimination of Fluoroamphetamine Regioisomers by Raman Spectroscopy (2016)
  4. Fluoroamphetamine assay validation (J Anal Toxicol 2017)
  5. Fluoroamphetamine assay validation (J Anal Toxicol 2017)
  6. INCB Technical Report on illicit-lab precursors (2017)
  7. LC-MS/MS oral-fluid method including 2-FA (Anal Chim Acta 2019)
  8. LC–MS/MS oral-fluid method including 2-FA (Anal Chim Acta 2019)
  9. PubChem: CID 121531
  10. Reddit: r/researchchemicals - 2-FA is actually great (2025)
  11. Reddit: r/researchchemicals - Recreational dose discussion (2019)
  12. Smart - Fluorine substituent effects on bioactivity (J Fluorine Chem 2001)

Article Status

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Recent changes8 human edits · latest

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11 August 2026

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  2. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

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  6. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

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