Mephedrene (5-MMPA)

Mephedrene, also known as 5-methylmethiopropamine (5-MMPA), is a synthetic psychoactive stimulant and emerging new psychoactive substance. Chemically, it is identified as N-methyl-1-(5-methylthiophen-2-yl)propan-2-amine. It is structurally related to methiopropamine and belongs to the broader family of substituted stimulant compounds.

Mephedrene has attracted scientific and forensic interest because relatively limited information is available concerning its pharmacology, metabolism, toxicology, and long-term effects. Reports have documented its appearance in online research-chemical markets and its identification in forensic investigations.

Recent research has raised particular concern about cardiovascular effects associated with mephedrene exposure. A 2026 study reported concentration-dependent effects on cardiac cells and significant QT-interval prolongation in an animal model, highlighting potential cardiotoxicity and the need for continued toxicological investigation.

For researchers, forensic professionals, and scientific readers, relevant keywords include mephedrene, 5-MMPA, 5-methylmethiopropamine, stimulant research, novel psychoactive substances, chemical analysis, forensic toxicology, metabolism, and toxicological research.

Mephedrene should not be presented as a proven safe, therapeutic, or recreational product. Applicable laws and regulations should be verified before any handling, possession, analysis, or research involving this substance.