yellow2 → orange2 → red2
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3-FMC
3-Fluoromethcathinone
3-FMC is a synthetic stimulant of the substituted cathinone and phenethylamine classes.citation needed It is a structural isomer of flephedrone (4-fluoromethcathinone)1 and is pharmacologically related to mephedrone. 3-FMC has been distributed online as a designer drug, producing effects characteristic of its class.citation needed It may function as a monoamine releaser, reuptake inhibitor, or both.2 The substance is considered habit-forming and may carry significant addiction potential.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Threshold~25 mg
Light25-50 mg
Moderate50-100 mg
Strong100-150 mg
Heavy150+ mg
Duration
Total2-4 hours
Subjective Effects
Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.
3-FMC produces a classic synthetic cathinone stimulant experience centered on euphoria, mood lift, heightened energy, and a strong drive toward socializing and conversation. The experience carries a notable emotional volatility, with sociable enthusiasm capable of giving way to moodiness or aggression. Sensory alterations are largely absent at common doses, though visual and auditory hallucinations have been reported, typically in the context of heavy or sleep-deprived use.
Physical
Physical effects are typical of stimulants: increased energy and alertness, a reduced need for sleep, appetite suppression, sweating, jaw clenching, itchiness, and heightened libido. Disturbed sleep patterns and weight loss are associated with continued use.
Stimulation
Uncomfortable
Cognitive
The headspace is energetic and extroverted, marked by euphoria, an elevated mood, increased sociability, and excessive talkativeness. This can be accompanied by mood instability, with irritability or aggressive behavior emerging as less desirable counterparts to the initial mood lift.
Emotional
The emotional tone is initially elevated and enthusiastic but can be unstable.
Visual
Visual effects are not characteristic of typical use, though hallucinations have been reported at heavier levels of use.
Auditory
Auditory hallucinations have been reported alongside visual hallucinations.
Pharmacology
Pharmacodynamics
The precise mechanism of action of 3-FMC has not been well characterized. It may function as a monoamine releasing agent, a monoamine reuptake inhibitor, or both.2
Pharmacokinetics
There have been no studies on the pharmacokinetic profile of 3-FMC and the metabolism of 3-FMC is unknown.
Metabolitesnone documented yet
Interactions
Interactions not written up yet
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Tolerance not written up yet
Harm Potential
Addiction & Dependence
Psychological
Classified as habit-forming and may possess high addiction potential according to anecdotal reports, though this has not been scientifically verified.
Toxicity
Upper Respiratory
Intranasal administration is reported to be very harsh on nasal membranes; occasional insufflation may cause irritation while frequent use could potentially cause more significant damage to nasal tissue.
Psychosis Risk
Visual and auditory hallucinations have been reported as effects, suggesting some potential for psychotomimetic effects, though the safety profile has not been scientifically studied.
History & Culture
3-Fluoromethcathinone emerged as part of the wave of novel cathinone designer drugs sold online, appearing alongside numerous other synthetic cathinones marketed as alternatives to controlled stimulants.citation needed As a structural isomer of flephedrone (4-fluoromethcathinone), it belongs to a…
Legality
By Country
Illegal8
United StatesIllegal21 CFR 1308.1112
Classified as a Schedule I controlled substance under federal law.13 Considered to have high abuse potential with no accepted medical use. Possession, distribution, and manufacturing are prohibited.
By state
All 50 U.S. states, the District of Columbia, and five territories were reviewed against the federal baseline. 17 jurisdictions had source-backed mirror treatment; 38 remain research gaps. 1 divergent jurisdiction findings were independently upheld.
CaliforniaIllegalCal. Health & Safety Code § 11375.5(c)14
California regulates 3-FMC as a synthetic stimulant compound rather than as a Schedule I substance. The statute covers substances structurally derived from 2-amino-1-phenyl-1-propanone with phenyl-ring halide substitution and nitrogen alkyl substitution. Possession for use is an infraction for a first offense, while sale and possession for sale are misdemeanors.
Czech RepublicIllegalGovernment Regulation No. 463/2013 Coll.3
Prohibited substance under national drug legislation. Possession, production, and distribution are illegal.
NetherlandsIllegal (analog/blanket ban)Opiumwet, lijst IA6
3-FMC is covered as a cathinone-derived substance within List IA's group of substances derived from 2-phenethylamine. The group definition expressly includes substances with the cathinone base structure and permits fluorine substitution on the phenyl ring. Article 2a prohibits import, export, preparation, sale, supply, transport, possession and manufacture of a substance in a List IA group, subject to specified exemptions.
NorwayIllegalForskrift om narkotika7
3-FMC is listed in Norway's narcotics regulation as 3-fluormetkatinon.
SingaporeIllegal (analog/blanket ban)Misuse of Drugs Act 1973, First Schedule, Class A drugs, paragraph 168
3-FMC is controlled as a Class A drug under Singapore’s Misuse of Drugs Act 1973. The First Schedule’s synthetic-cathinone generic group covers compounds structurally derived from 2-amino-1-phenylpropan-1-one with phenyl-ring halide substitution and nitrogen alkyl substitution. This covers 3-FMC’s 3-fluorophenyl and N-methyl substitutions; it is not based on the separately listed 3-MMC or 4-FMC entries.
SwedenIllegalFörordning (1992:1554) om kontroll av narkotika9
3-FMC is expressly listed by its chemical name in the regulation's annex of substances regarded as narcotics.
References
Source Pages
Citations
- R.P. Archer. (March 2009). Fluoromethcathinone, a new substance of abuse. Forensic Science International, 185(1–3), 10–20. https://doi.org/10.1016/j.forsciint.2008.11.0131
- Wojcieszak J, Andrzejczak D, Wojtas A, Pawlowski M, Budziszewska B, & Zawilska JB. (2019). Methcathinone and 3-Fluoromethcathinone Stimulate Spontaneous Horizontal Locomotor Activity in Mice and Elevate Extracellular Dopamine and Serotonin Levels in the Mouse Striatum. https://doi.org/10.1007/s12640-018-9973-412
- Government Regulation No. 463/2013 Coll.. zakonyprolidi.cz (n.d.). https://www.zakonyprolidi.cz/cs/2013-4631
- Anlage II BtMG – verkehrsfähige, aber nicht verschreibungsfähige Betäubungsmittel. gesetze-im-internet.de (n.d.). https://www.gesetze-im-internet.de/btmg_1981/anlage_ii.html1
- Betäubungsmittelgesetz (BtMG). gesetze-im-internet.de (n.d.). https://www.gesetze-im-internet.de/btmg_1981/__13.html1
- Opiumwet, lijst IA. wetten.overheid.nl (n.d.). https://wetten.overheid.nl/BWBR0001941/2025-07-011
- Forskrift om narkotika. lovdata.no (n.d.). https://lovdata.no/dokument/SF/forskrift/2013-02-14-199/KAPITTEL_11
- Misuse of Drugs Act 1973, First Schedule, Class A drugs, paragraph 16. sso.agc.gov.sg (n.d.). https://sso.agc.gov.sg/Act/MDA1973?ProvIds=Sc1-1
- Förordning (1992:1554) om kontroll av narkotika. riksdagen.se (n.d.). https://www.riksdagen.se/sv/dokument-och-lagar/dokument/svensk-forfattningssamling/forordning-19921554-om-kontroll-av-narkotika_sfs-1992-1554/1
- Misuse of Drugs Act 1971. legislation.gov.uk (n.d.). https://www.legislation.gov.uk/ukpga/1971/38/schedule/21
Further Reading
Article Status
Step 1 · Automated synthesisAn autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.
- Step 2 · First-pass reviewPending
Not yet reviewed — this article is pending editorial review by Lyrea.
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Recent changes7 human edits · latest
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24 January 2026
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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