Methylenedioxypyrovalerone (MDPV) is a psychoactive drug

Psychoactive drug

A psychoactive drug, psychopharmaceutical, or psychotropic is a chemical substance that crosses the blood–brain barrier and acts primarily upon the central nervous system where it affects brain function, resulting in changes in perception, mood, consciousness, cognition, and behavior...

 with stimulant

Stimulant

Stimulants are psychoactive drugs which induce temporary improvements in either mental or physical function or both. Examples of these kinds of effects may include enhanced alertness, wakefulness, and locomotion, among others...

 properties which acts as a norepinephrine-dopamine reuptake inhibitor

Norepinephrine-dopamine reuptake inhibitor

A norepinephrine-dopamine reuptake inhibitor is a drug which acts as a reuptake inhibitor for the neurotransmitters norepinephrine and dopamine by blocking the action of the norepinephrine transporter and the dopamine transporter , respectively...

 (NDRI). Reportedly, it has been sold since around 2004 as a designer drug

Designer drug

Designer drug is a term used to describe drugs that are created to get around existing drug laws, usually by preparing analogs or derivatives of existing drugs by modifying their chemical structure to varying degrees, or less commonly by finding drugs with entirely different chemical structures...

. It is also known as MDPK, MTV, Magic, Maddie, Black Rob, Super Coke and PV. In 2010 it was reportedly sold as a legal drug alternative.

Incidences of psychological and physical harm have been attributed to MDPV use.
The hydrochloride salt exists as a very fine, hygroscopic, crystalline powder that tends to clump to itself, resembling something like powdered sugar.