Overview Methylphenidate in Myotonic Dystrophy Type 1 Status: Completed Trial end date: 2010-09-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine whether methylphenidate is effective in the treatment of excessive daytime sleepiness due to myotonic dystrophy type 1 (DM1). Phase: Phase 2/Phase 3 Details Lead Sponsor: Laval UniversityTreatments: Methylphenidate