The objective of this exploratory study is to assess the benefits of memantine compared to placebo in out-patients with a diagnosis of Parkinson's Disease Dementia or Dementia with Lewy Bodies (mild to moderate severity) over a 6-month period. This is a multinational, randomised, double-blind, parallel-group, placebo-controlled, fixed-dose study with specific cognitive (attention, executive function, visual perception and memory), behavioural, functional and global measures.
The purpose of this exploratory study is to determine whether memantine can provide benefits on clinical symptoms in patients with Parkinson's Disease Dementia or Dementia with Lewy Bodies.