Sildenafil (Viagra(R))is widely used by men with Parkinsons Disease (PD) and erectile
dysfunction. A number of patients have reported that when they take Sildenafil, their need of
anti-PD medication is reduced.
We hypotheses that sildenafil increases brain blood flow and hence improves the function of
specific brain regions, improving motor function.
Motor function and cerebral blood flow of 8 patients will be tested before and after
Sildenafil intake and before and after anti-PD medication.