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4-Methylmethcathinone (also known as 4-MMC, M-CAT, drone, meow meow, and mephedrone^[1]) is a novel entactogen–stimulant substance of the cathinone class. Mephedrone belongs to a group known as the substituted cathinones, which are derivatives of the active ingredient in the khat plant (Catha edulluis). It is thought to produce its effects by promoting the release of the neurotransmitters serotonin, dopamine, and norepinephrine in the brain.^{[citation needed]}

Limited data exists about the pharmacological properties, metabolism, and toxicity of mephedrone. Preliminary evidence suggests it may possess neurotoxic and cardiotoxic properties.^{[citation needed]} It is highly advised to use harm reduction practices if using this substance.