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4-MMC, commonly known as mephedrone, is a synthetic cathinone and central nervous system stimulant. It became widely known in Europe in the late 2000s as part of the “novel psychoactive substances” (NPS) wave.
What Is 4-MMC?
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Chemical name: 4-Methylmethcathinone
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Drug class: Synthetic cathinone (β-keto amphetamine)
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Common name: Mephedrone
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Chemical family: Related to amphetamines and cathinone
It is structurally similar to methcathinone, with a methyl group at the 4-position (para position) on the aromatic ring.
How It Works (Pharmacology)
4-MMC acts primarily as a monoamine releasing agent, increasing levels of:
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Dopamine → euphoria and reward
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Serotonin → empathy and mood elevation
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Norepinephrine → stimulation and alertness
Because it strongly affects both dopamine and serotonin, it produces both stimulant and empathogenic effects.
4-MMC (mephedrone) is a synthetic stimulant with both euphoric and empathogenic properties. While it became popular as a “legal high” in the past, it carries significant health and legal risks and lacks approved medical use.
A synthetic stimulant is a man-made (laboratory-produced) substance designed to stimulate the central nervous system (CNS). These drugs increase brain activity, alertness, energy, heart rate, and blood pressure.
They are chemically created to mimic or modify the effects of traditional stimulants like amphetamine or cocaine.
How Synthetic Stimulants Work
Most synthetic stimulants increase levels of key brain chemicals:
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Dopamine → pleasure, reward, motivation
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Norepinephrine → alertness, heart rate
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Serotonin (in some cases) → mood and empathy
They may act by:
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Releasing these neurotransmitters
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Blocking their reuptake
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Or doing both
This overstimulation leads to increased energy and euphoria, but also raises health risks.
A synthetic stimulant is a lab-made drug that increases brain and nervous system activity. Some are medically useful under supervision, while others pose serious health and legal risks due to lack of regulation and safety data.

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