Pyrovalerone is a psychoactive compound with stimulatory effects. It is a controlled drug that has been found as a contaminant in products sold as bath salts. Naphyrone (hydrochloride) is an analog of pyrovalerone that is characterized by the substitution of the methylphenyl group of pyrovalerone with a naphthyl group. Naphyrone potently inhibits dopamine, serotonin, and norepinephrine transporters (IC50 = 20, 33, and 136 nM, respectively). Naphyrone, like pyrovalerone, has been detected in bath salt-type products. This compound is intended for forensic and research purposes.