Researchers at Harmony Biosciences are seeking adults living with myotonic dystrophy, type 1 (DM1) to participate in a phase 2 clinical trial and open-label extension to evaluate safety and efficacy of the investigational drug pitolisant (brand name Wakix) to treat excessive daytime sleepiness and other non-muscular symptoms of DM1. Pitolisant treatment increases the amount the chemical . . .