Methylenedioxypyrovalerone, also known as MDPK or 1-(3,4-methylenedioxyphenyl)-2-pyrrolidinyl-pentan-1-one, is a stimulant drug which acts as a norepinephrine and dopamine reuptake inhibitor, reportedly with four times the potency of methylphenidate. This compound is reported to be used as a stimulant and an aphrodisiac. It has no history of medical use but has been sold as a designer drug for recreational use. Appearance and effects The substance appears as a pure white to light-brown, signi… (More on Mdpv)