Mephedrone, also known as 4-methylmethcathinone (4-MMC), is a synthetic stimulant drug chemically related to cathinone, a naturally occurring stimulant found in the khat plant. It is classified within the phenethylamine and amphetamine classes of drugs and has gained notoriety as a designer drug or “legal high.” Mephedrone is structurally similar to other stimulants like methamphetamine and MDMA, differentiated by the presence of a β-keto group and a methyl group on the aromatic ring. It typically appears as a white crystalline powder, which can be ingested, snorted, vaporized, or sometimes injected.
Chemical Properties and Structure
Mephedrone’s chemical formula is C11H15NO with a molecular weight of 177.24 g/mol. Its chemical name is 4-methylmethcathinone, with an indole core and a β-keto group that defines it as a cathinone derivative. The addition of the 4-methyl group increases its potency compared to cathinone. In its pure form, mephedrone is a white or off-white powder with solubility in water and organic solvents, making it versatile for multiple routes of administration.
How Mephedrone Is Used
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Recreational Use: The most common use of mephedrone is recreational, often as a substitute for illicit stimulants and entactogens such as cocaine, methamphetamine, and MDMA. It produces effects such as euphoria, increased energy, enhanced sociability, increased alertness, and tactile sensitivity.
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Routes of Administration:
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Snorting (insufflation) the powder is the most prevalent mode of use, allowing rapid absorption through the nasal mucosa.
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Oral ingestion is also common, where mephedrone is taken as a pill or powder.
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Some users vaporize or smoke mephedrone, though this is less common.
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Intravenous or intramuscular injection is rare and riskier.
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Dosing: Effects typically begin within 15-45 minutes depending on the route, lasting approximately 2-4 hours, with residual effects sometimes lasting longer.
Effects and Pharmacology
Mephedrone acts primarily by increasing the release and inhibiting the reuptake of monoamine neurotransmitters—dopamine, norepinephrine, and serotonin—in the brain. This triple action contributes to its stimulant, euphoric, and empathogenic properties. The drug’s pharmacodynamics resemble those of MDMA and cocaine but with distinct profiles influenced by dosage and individual biochemistry.
Common effects include:
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Euphoria and heightened mood
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Increased energy and alertness
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Enhanced sociability and talkativeness
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Heightened sensory perception and tactile sensitivity
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Increased heart rate and blood pressure
Adverse effects may include anxiety, paranoia, headaches, nausea, increased thirst, tachycardia, and in severe cases, psychosis or cardiovascular events.
Risks, Addiction, and Legal Status
Mephedrone carries considerable risks including addiction, physical and psychological harm, and acute toxicity. Its use has been linked to emergency hospital visits due to overdose and adverse psychological effects. Withdrawal symptoms may include depression, fatigue, irritability, and cognitive disturbances.
Legally, mephedrone is controlled in many countries and classed as a Schedule I substance in the United States and similarly regulated elsewhere, reflecting high abuse potential and lack of accepted medical use.




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