|Other names||MPA; Methiopropamine; Methedrene; Syndrax|
|Chemical and physical data|
|Molar mass||155.26 g·mol−1|
|3D model (JSmol)|
|(what is this?)|
Methiopropamine (MPA) is a thiophene ring-based structural analog of methamphetamine originally reported in 1942. Chemically it is not a phenethylamine or amphetamine and is not their functional analog either. It originally appeared for public sale in the UK in December 2010 as a "research chemical" or "legal high", recently branded as Blow. It has limited popularity as a recreational stimulant.[unreliable source?]
Methiopropamine functions as a selective norepinephrine-dopamine reuptake inhibitor that is approximately 1.85 times more selective for norepinephrine than dopamine. It is approximately one third as potent as dextroamphetamine as a norepinephrine reuptake inhibitor and one fifth as much as a dopamine reuptake inhibitor. It displays negligible activity as a serotonin reuptake inhibitor.
For N-alkyl amphetamines, deamination and N-dealkylation are the major elimination pathways and renal excretion is a minor one. Methiopropamine is metabolized into active thiopropamine, 4-hydroxymethiopropamine and thiophene S-oxides. These N-demethylated metabolites are further deaminated by the cytochrome P450 enzyme CYP2C19 in the liver transforming them into inactive 1-(thiophen-2-yl)-2-propan-2-one which can be seen as a phenylacetone derivative.
There is a four-step synthesis of methiopropamine. It begins with (thiophen-2-yl)magnesium bromide, which is reacted with propylene oxide, yielding 1-(thiophen-2-yl)-2-hydroxypropane which is reacted with phosphorus tribromide, yielding 1-(thiophen-2-yl)-2-bromopropane which is finally reacted with methylamine, yielding 1-(thiophen-2-yl)-2-methylaminopropane.
As of October 2015 MPA is a controlled substance in China.
Methiopropamine is illegal in Finland.
Methiopropamine is explicitly illegal in Germany.
Following the ban on ethylphenidate authorities noticed an increase in methiopropamine use by injecting users. The ACMD suggested it be banned on 18 November 2015 as it had similar effects to ethylphenidate. The government enacted a temporary drug control order a week later which came into force on 27 November 2015. Though ordinarily the TCDO would only last 1 year, the ACMD reported that since its invocation prevalence of MPA had significantly decreased, and that it had been challenging to collect information about the drug. As a result of this, they requested that the TCDO be extended a further year.
Methiopropanine was made a Class B controlled drug under the Misuse of Drugs Act 1971 (as amended) (Amendment)(No.2) Order 2017 [SI 2017/1114], this came into effect on the 27th of November 2017.
Methiopropamine is not scheduled at the federal level in the United States. The DEA has planned to place methiopropamine in Schedule I of Controlled Substances and is currently accepting public comment until October 4, 2021 (see: https://www.deadiversion.usdoj.gov/fed_regs/rules/2021/fr0902_2.htm).
Methiopropamine is a "controlled substance" and therefore an "illegal drug" to import, possess or sell/traffic in without express authority of the relevant government agency. 
- α-Pyrrolidinopentiothiophenone (α-PVT)
- Thiopropamine, demethylated counterpart
- Propylhexedrine, another ring substituted stimulant used as over-the-counter decongestant
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- "The Misuse of Drugs Act 1971 (Temporary Class Drug) (No. 3) Order 2015". UK Government. 23 November 2015.
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- 21 CFR — SCHEDULES OF CONTROLLED SUBSTANCES §1308.11 Schedule I.
- Florida Statutes - Chapter 893 - DRUG ABUSE PREVENTION AND CONTROL