3-MMC

3-Methylmethcathinone

Metaphedrone, 3M, meow, mcat, 3-meph

Psychoactive Class

Chemical Class

3-MMC is a synthetic stimulant-entactogen of the substituted cathinone class.¹ It is a structural isomer of mephedrone (4-MMC) and first appeared in Sweden in 2012 as a designer drug alternative following mephedrone's widespread prohibition. It quickly gained presence on the online research chemical market and has frequently been marketed as a mephedrone substitute. Insufflation of this substance is reported to be notably painful.

Dosage & Duration

Dosage

Threshold~25 mg

Light25-75 mg

Moderate75-150 mg

Strong150-300 mg

Heavy300+ mg

Bioavailability

~7%

Duration

Onset10-30 minutes

Come Up30-60 minutes

Peak2-3 hours

Offset1-1.5 hours

After Effects2-4 hours

Total4-6 hours

Half-life

~50 minutes

Subjective Effects

Effects vary widely by individual, dose, and context.

Forked from Subjective Effect Documentation work

by Josie KinsAugust 2016.

Reagent Testing

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

Mandelin(MD)

Liebermann(LB)

Morr(MO)

Simons(SI)

PROtestkit.eu

Pharmacology

Pharmacodynamics

3-MMC acts as a monoamine transporter substrate that potently releases dopamine and norepinephrine and inhibits their reuptake at the respective transporters.² It displays moderate serotonin releasing activity, with greater selectivity for dopamine and especially norepinephrine over serotonin as a releasing agent.² 3-MMC binds to serotonin 5-HT1A, 5-HT2A, and 5-HT2C receptors and adrenergic α1A and α2A receptors, with substantially stronger affinity at the adrenergic sites.² It lacks agonist activity at the 5-HT2A receptor and is inactive at rat and human TAAR1.³²

Pharmacokinetics

The oral bioavailability of 3-MMC has been estimated at approximately 7% in a pig study, with peak blood concentrations attained within 5 to 10 minutes and an elimination half-life of roughly 50 minutes.⁴ Plasma concentrations fell below the limit of detection 24 hours after oral ingestion.⁴ The metabolic pathway is not well characterized but is thought to involve β-keto-reduction followed by N-demethylation.⁵

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.

5-HTPAlcoholDXMDissociativesMAOIsMDMAMXENBOMe compoundsSNRIsSSRIsSerotonin releasersStimulantsTramadol

TripSit

Tolerance

Full Tolerance

Repeated 3-MMC use over time can produce tolerance across many effects, leading users to need larger doses for similar results. The compound's strong compulsive-redosing potential can speed tolerance development during prolonged sessions.

Baseline Reset

1-2 weeks

Half Tolerance

3-7 days

Cross Tolerance

Dopaminergic stimulants

Harm Potential

Addiction & Dependence

Psychological

High

3-MMC is described as extremely addictive with a high potential for abuse, reportedly more so than mephedrone.¹ Its short-lived euphoric rush combined with dopaminergic effects produces intense compulsive redosing, with users commonly consuming 0.5-2 grams in multi-hour sessions despite intending smaller doses.⁷

Physical

Moderate

Physical dependence can develop with chronic use. Cravings and withdrawal effects may occur upon sudden cessation, though specific withdrawal symptoms are not well-characterized in the literature.¹

Toxicity

Cardiovascular

Preliminary evidence suggests chronic high-dose use may carry cardiotoxic risks; acute effects include increased heart rate, elevated blood pressure, abnormal heartbeat, and vasoconstriction that can limit blood flow to organs.⁸ Heart valve issues have also been suggested but remain poorly characterized.

Central Nervous System

Preliminary evidence suggests chronic high-dose use may carry neurotoxic risks; symptoms of serotonin depletion are reported with overuse, manifesting as depression, cognitive fatigue, and motivation suppression during comedown periods.⁷

Musculoskeletal

Rhabdomyolysis has been reported as a serious adverse effect,¹ typically in cases involving hyperthermia and physical exertion.

Psychosis Risk

Delirium and confusion can occur at high doses, particularly when combined with temperature dysregulation, overheating, and inability to rest or rehydrate.¹ Risk of delusions and mania may be elevated when combined with dissociatives.

Seizure Risk

Seizures are a rare but documented adverse effect,¹ more likely in predisposed individuals or when taking heavy doses while dehydrated, undernourished, overheated, or fatigued.

History & Culture

Discovery and Emergence

3-MMC was first encountered in Sweden in 2012,⁹ emerging on the online research chemical market shortly after the banning of mephedrone in numerous countries.¹ It was created as a designer drug specifically chosen to mimic and…

Legality

International

UN Convention on Psychotropic Substances 1971 (Schedule II, placed March 2023)¹⁵

By Country

United StatesIllegalSchedule I

21 CFR 1308.11(d)³⁴³⁵

Illegal as a positional isomer of the controlled substance mephedrone. Explicitly designated as a controlled substance on December 13, 2023, and categorized by the DEA as a Schedule I positional isomer.³⁶

AustriaIllegal (NPSG)Citation needed

Prohibited under the Neue-Psychoaktive-Substanzen-Gesetz (New Psychoactive Substances Act). Possession, production, and sale are illegal.

BrazilIllegalCitation needed

Listed on Portaria SVS/MS nº 344. Possession, production, and sale are prohibited under this regulation.

Czech RepublicIllegalPříloha č. 4

Government Regulation No. 463/2013 Coll., on lists of addictive substances¹⁹²⁰

Banned substance under national drug control legislation.

GermanyIllegalAnlage I

Betäubungsmittelgesetz, Anlage I²²²³²⁴

3-MMC (3-Methylmethcathinon) is listed in Anlage I to Germany's Betäubungsmittelgesetz as 2-(Methylamino)-1-(3-methylphenyl)propan-1-on. Anlage I contains non-marketable narcotics, for which the Federal Institute for Drugs and Medical Devices may grant authorization only exceptionally for scientific or other public-interest purposes. Unauthorized manufacture, trade, import, export, sale, acquisition, or possession without the required written acquisition authorization is punishable by up to five years' imprisonment or a fine.

NetherlandsIllegalLijst I

Opiumwet, lijst I²⁵

Initially classified as a List II (soft drug) substance effective October 28, 2021.²⁶ Subsequently reclassified to List I (hard drug) in April 2024,²⁵ carrying more severe penalties for possession and distribution.

PolandIllegalII-P

Rozporządzenie Ministra Zdrowia z dnia 8 kwietnia 2024 r. zmieniające rozporządzenie w sprawie wykazu substancji psychotropowych, środków odurzających oraz nowych substancji psychoaktywnych (Dz.U. 2024 poz. 536)²⁸²⁹

Classified as a II-P category controlled substance since April 25, 2024, making possession, production, and distribution illegal.

SwedenIllegalBilaga 1

Förordning (1992:1554) om kontroll av narkotika³¹³²

Classified as a narcotic substance under Swedish drug control legislation.

TurkeyIllegalCitation needed

Classified as a controlled drug. Possession, production, supply, and importation are prohibited.

AustraliaIllegalprohibited import

Customs (Prohibited Imports) Regulations 1956¹⁶

3-MMC is named in Australia's Customs (Prohibited Imports) Regulations 1956. The regulations prohibit its importation except as permitted by the regulatory scheme.

BelgiumIllegalAnnexe IIb

Royal Decree of 6 September 2017 regulating narcotic and psychotropic substances, as amended by the Royal Decree 2023-02-08/06¹⁷¹⁸

3-MMC is a controlled psychotropic substance in Belgium under Annex IIb of the Royal Decree of 6 September 2017 regulating narcotic and psychotropic substances. Since 17 March 2023, its import, export, transport, manufacture, production, possession, sale, supply, delivery, and acquisition require prior authorization; authorization is limited to scientific or medical purposes. Contraventions are punishable under Article 2bis of the Law of 24 February 1921.

ChinaControlledCitation needed

Banned since October 2015 along with numerous other synthetic compounds. This ban significantly impacted global availability as Chinese chemical companies were primary manufacturers.

DenmarkIllegalListe B

Bekendtgørelse om euforiserende stoffer (nr. 405 af 26. marts 2026)²¹

3-MMC is listed as 3-Methylmethcathinon on Liste B of Denmark's Executive Order on Euphoriant Substances. Liste B substances may be used only for medical and scientific purposes. Receipt and possession are limited to the persons, institutions, pharmacies, laboratories, and businesses authorized under the Order; import, export, manufacture, preparation, and trade are likewise regulated by authorization requirements.

IndiaNarcoticCitation needed

Designated as a narcotic substance on February 8, 2024, making possession, production, and distribution illegal.

NorwayIllegalnarkotika

Forskrift om narkotika (narkotikaforskriften)²⁷

3-MMC is listed in Norway's narcotics regulation as 3-metylmetkatinon. The regulation's prohibition applies to listed narcotic substances.

South AfricaIllegal (analog/blanket ban)Part III

Drugs and Drug Trafficking Act 140 of 1992, Schedule 2³⁰

3-MMC (3-methylmethcathinone) is covered in Schedule 2 Part III as a homologue of the listed substance methcathinone. Part III covers chemically related substances that incorporate a structural fragment similar to a listed substance or have similar pharmacodynamic properties, unless separately listed elsewhere in Schedule 2. The Act prohibits possession, use, and dealing in Part III drugs except in the statutory medicinal and authorised-professional circumstances; contraventions are offences. The current Schedule 2, including this homologue provision, was substituted with effect from 14 December 2022.

SwitzerlandControlled (Verzeichnis E)Citation needed

Regulated as a defined derivative of cathinone under Verzeichnis E point 1. Use is permitted for legitimate scientific or industrial purposes only.

United KingdomIllegalClass B

Misuse of Drugs Act 1971, Schedule 2³³

Controlled as a Class B substance under the Misuse of Drugs Act 1971 through the cathinone catch-all clause, which covers structurally related compounds.

References

Source Pages

Citations

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3-MMC

3-Methylmethcathinone

Metaphedrone, 3M, meow, mcat, 3-meph

Psychoactive Class

Stimulant Entactogen

Chemical Class

Cathinone (substituted)