Mephedrone is a psychoactive drug that temporarily enhances mental function, physical function, or both. It is a synthetic stimulant. It is also called 4-methylmethcathinone (4-MMC), or 4-methylephedrone, and should not be confused with methadone, which is a totally different substance. Street names for mephedrone include meph, MCAT, bubbles, drone, miaow, white magic, and M-smack. Mephedrone is considered a recreational drug. This means that people use it occasionally for enjoyment, and there is no medical justification for its psychoactive effects.