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Methiopropamine (MPA) is a thiophene-ring analog of methamphetamine, meaning the benzene ring is swapped for a sulfur-containing thiophene ring. It works as a norepinephrine and dopamine reuptake inhibitor, giving a fairly plain, functional stimulation that users often describe as milder and more short-lived than methamphetamine. It was sold widely as a research chemical stimulant.
- Functional alertness
- Increased energy
- Milder than methamphetamine
- Compulsive redosing from short duration
- Raised heart rate and blood pressure
- Insomnia and anxiety
- Comedown fatigue
Mechanism
MPA inhibits the transporter most strongly and the more weakly (it blocks the proteins that recycle these neurotransmitters). Its weaker action compared to methamphetamine is thought to give it a less euphoric, more "wired" character. The thiophene substitution keeps it in the same functional class as methamphetamine but changes its potency.
receptor fingerprint
transporter (NET)Reuptake inhibitor
()Reuptake inhibitor
Safetyrisks and cautions, not medical advice
Despite feeling mild it still strains the cardiovascular system, causing raised heart rate, high blood pressure, insomnia, and anxiety, and users often redose compulsively because the effects are short. Reports have linked heavy use to chest pain, breathing problems, and even fatalities when combined with other drugs. Mixing it with other stimulants, MAOIs, or depressants raises the risk significantly. Not medical advice.
Subjective profileweighing the evidence above
Not worth it. The mildness is the trap, because the short duration drives compulsive redosing, and the cardiovascular strain, insomnia and flat comedown arrive anyway. Heavy use has been linked to chest pain, breathing problems and deaths in combination.
Resources
This entry is here for reference.
Research
- 1.Comparative Neuropharmacology and Pharmacokinetics of Methamphetamine and Its Thiophene Analog Methiopropamine in Rodents
- 2.New Psychoactive Substances: Chemistry, Pharmacology, Metabolism, and Detectability of Amphetamine Derivatives With Modified Ring Systems
2 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
How does MPA differ from methamphetamine?
It swaps the benzene ring for a thiophene ring and leans more on norepinephrine than dopamine, so it tends to feel less euphoric and shorter-lasting.
Is methiopropamine safe because it feels mild?
No. Its short duration encourages heavy redosing, and it still causes cardiovascular strain that has been linked to serious harm.
Was it ever legal?
It was sold openly as a research chemical stimulant before many countries restricted it.
Adverse effects
- Compulsive redosing from short duration
- Raised heart rate and blood pressure
- Insomnia and anxiety
- Comedown fatigue