A Trial to Explore the Potential Benefit of Safinamide on Cognitive Impairment Associated With Parkinson's Disease

The purpose of this research trial is to determine if safinamide (experimental drug) can improve cognition in cognitively impaired but non-demented Parkinson\'s disease patients. The word \"experimental\" means the trial drug is not approved by Health Authorities (government authorities) and is still being tested for safety and effectiveness. Approximately one hundred (100) patients will participate in this research trial. The research trial will be conducted in approximately thirty (30) medical centers in the following countries: Argentina, Canada, Italy, Peru, South Africa, Spain and USA. The research trial will last until June 2012.