Buy pure high quality 4-MMC Crystal online with Bitcoin - Buy legal drugs online, buy research chemicals, buy raw pharmaceutical powders. 4-MMC Crystal for sale overnight delivery. Mephedrone is a stimulant drug belonging to the chemical family of the cathinone group of drugs. Cathinones are a group of drugs related to amphetamine compounds like speed and ecstasy. Mephedrone, also known as 4-methyl methcathinone (4-MMC) or 4-methyl ephedrine, is a synthetic stimulant drug of the amphetamine and cathinone classes. Slang names include drone, M-CAT, White Magic and meow meow. Mephedrone (4-MMC) is chemically similar to the cathinone compounds found in the khat plant of eastern Africa. It comes in the form of tablets or a powder, which users can swallow, snort or inject, producing similar effects to MDMA, amphetamines and cocaine.