Research chemicalStimulantResearch chemicalSubstituted methamphetamineSerotonin releaser

4-Methylmethamphetamine (4-MMA)

Also known as 4-MMA · para-methylmethamphetamine · 4-methylmethamphetamine

Written by enwyReviewed 4 Aug 20262 sources0 comments

4-Methylmethamphetamine (4-MMA) is a ring-methylated methamphetamine analogue with substantial serotonin-releasing activity. Its pharmacology resembles the para-methylated 'toxic' amphetamines (PMA/PMMA family in effect profile), and it has been associated with serotonergic toxicity and deaths. Human data is very limited.

01 Overview

4-MMA is methamphetamine with a methyl group added to the aromatic ring at the para position. This substitution markedly increases serotonergic activity, giving it a profile more hazardous than methamphetamine and reminiscent of para-substituted amphetamines known for serotonin toxicity.

There is little controlled human data; knowledge derives from animal studies, analytical case reports and monitoring of deaths involving related compounds. The combination of stimulant and strong serotonergic action raises the risk of hyperthermia and serotonin toxicity.

02 Mechanism

Releases dopamine, noradrenaline and, prominently, serotonin. The para-methyl group shifts activity toward serotonin release, associated with hyperthermia and serotonin toxicity.

03 Dosing

Tier	Dose	Route	Notes
Threshold	10–25 mg	Oral	Anecdotal only; strong serotonergic toxicity risk means no safe range is established.
Light	15–40 mg	Insufflated	Faster onset; serotonergic toxicity remains a serious concern.
Light	25–50 mg	Oral	Delayed onset can encourage dangerous redosing.

04 Effects

Effect	Magnitude	Evidence
StimulationEnergy and wakefulness typical of methamphetamine analogues.	moderate	Anecdotal
Entactogenic warmthEmpathogenic mood effects from serotonin release, weaker than the toxicity risk it carries.		Anecdotal
Appetite suppressionReduced hunger during the active period.		Anecdotal

05 Side effects

Effect	Severity	Frequency	Evidence
Comedown and compulsive redosingLow mood and fatigue after use, with reinforcement driving redosing.	Moderate	Common	Anecdotal
Cardiovascular strainTachycardia and hypertension, worsened by hyperthermia.	Severe	Common	Unconfirmed
Serotonin toxicity and hyperthermiaStrong serotonin release can cause hyperthermia, agitation, rigidity and serotonin syndrome, which can be fatal.	Life-threatening	Uncommon	Observational

06 Legal status

Germany

NpSG (New Psychoactive Substances Act)

Captured by German amphetamine-class NPS legislation. · as of Jan 2026

United States

Not federally scheduled by name

Possible analogue under the Federal Analogue Act. · as of Jan 2026

07 References

Para-substituted methamphetamine analogues and serotonergic toxicityPubMed

New psychoactive substances overviewEUDA (European Union Drugs Agency)

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.