I work with many patients that have Parkinsons and am working towards specializing in this area. In working with Parkinson’s patients, I have found that more than not that they are depressed. Here is an article that was written about how the drug that helps Parkinsons can also relieve depression.
Medical News: Dopamine Agonist Relieves Depression in PD Patients – in Neurology, Parkinson’s Disease from MedPage Today