A Study to Evaluate Safinamide's Effect on Dopamine and Serotonin's Availability by Using Brain Imaging

"Safinamide 100 mg/day = two 50 mg tablets administered orally, once a day, in the morning, with or without food.~Safinamide 200 mg/day = four 50 mg tablets administered orally, once a day, in the morning, with or without food; this will be preceded by a three day titration of 150 mg = three 50 mg tablets administered orally, once a day, in the morning, with or without food.~Safinamide 300 mg/day = six 50 mg tablets administered orally, once a day, in the morning, with or without food; this will be preceded by a three day titration of 250 mg = five 50 mg tablets administered orally, once a day, in the morning, with or without food."