4-MMC is a stimulant, euphoriant, and to a lesser extent, an entactogen. While it was synthesized decades ago, the drug only has a short history of use. It’s a substituted amphetamine and it comes from the cathinone family.
Vasoconstriction is an established issue with the substance and it can be dangerous with strong doses, which are sometimes encountered due to redosing. Neurotoxicity also appears to be a concern with higher doses and its neurotoxicity may be additive with MDMA and methamphetamine’s.