A randomised, double-blind, 3-arm parallel group study comparing Aricept® with placebo.
Patients with an established diagnosis of PD and dementia, who fulfill all of the inclusion criteria and none of the exclusion criteria listed below, will be eligible for enrolment into this study.
Best efforts must be made on clinical grounds to exclude patients with DLB and AD. The key inclusion criteria in this respect is the onset of dementia documented to have occurred at least 1 year after the diagnosis of PD.