Pentylone (β-Keto-Methylbenzodioxolylpentanamine, βk-Methyl-K, βk-MBDP, methylenedioxypentedrone, or 1‐(3,4‐methylenedioxyphenyl)‐2‐(methylamino)pentan‐1‐one) is a stimulant developed in the 1960s. It is a substituted cathinone (a type of substituted phenethylamine). It has been identified in some samples of powders sold as "NRG-1", along with varying blends of other cathinone derivatives including flephedrone, MDPBP, MDPV and 4-MePPP.
It was also found in combination with 4-MePPP being sold as "NRG-3". Reports indicate side effects include feelings of paranoia, agitation and inability to sleep, with effects lasting for several days at high doses.
Pentylone is banned in Canada, Germany, Sweden, the United States and in the UK.