Overview Safety and Tolerability of Tozadenant as Adjunctive Therapy in Levodopa-Treated Patients With Parkinson's Disease. Status: Terminated Trial end date: 2018-01-16 Target enrollment: Participant gender: Summary Phase 3, international, multicenter, open-label 12 month safety study. Phase: Phase 3 Details Lead Sponsor: Biotie Therapies Inc.Collaborator: Acorda TherapeuticsTreatments: Levodopa