Overview Efficacy of Isradipine in Early Parkinson Disease Status: Completed Trial end date: 2018-11-01 Target enrollment: Participant gender: Summary The purpose of the study is to determine whether treatment with isradipine is effective in slowing the progression of Parkinson disease disability. Phase: Phase 3 Details Lead Sponsor: University of RochesterCollaborators: Michael J. Fox Foundation for Parkinson's ResearchNational Institute of Neurological Disorders and Stroke (NINDS)The Parkinson Study GroupTreatments: Isradipine