Overview The Efficacy, Tolerability and Safety of Donepezil (Aricept) in Parkinson's Disease Patients With Dementia Status: Completed Trial end date: 2005-07-01 Target enrollment: Participant gender: Summary A randomised, double-blind, 3-arm parallel group study comparing AriceptĀ® with placebo. Phase: Phase 3 Details Lead Sponsor: Eisai LimitedTreatments: Donepezil