Safety and Efficacy of Droxidopa for Fatigue in Patients With Parkinsonism

The purpose of this study is to determine the efficacy of Droxidopa for the treatment of fatigue in patients with Parkinsonism by the Visual Analog Fatigue Scale (VAFS). This is a randomized, placebo-controlled, double-blind clinical trial for 3 months where half the subjects will receive placebo and the other half will receive Droxidopa. Following this will be a wash-out period of 7 days and then all subjects will receive Droxidopa for 3 months during the open-label phase.