Long-term Administration Study of SND 919 Tablets in Parkinson's Disease

Inclusion Criteria: Patients with a diagnosis of Parkinson's disease (including juvenile parkinsonism) (1) Patients meeting all of the following inclusion criteria 1. Patients of at least 20 years of age 2. In- or outpatients of either sex. 3. Patients in any stage on the modified Hoehn and Yahr severity scale Exclusion Criteria: * Patients with psychiatric symptoms such as confusion, hallucination, delusion, excitement, delirium, and abnormal behaviour. * Patients with subjective symptoms derived from orthostatic hypotension. * Patients with hypotension (systolic blood pressure \<100 mmHg) * Patients with concomitant illness such as severe cardiac, renal, and hepatic disease * Patients with a current or past history of epilepsy * Pregnant, possibly pregnant, or lactating women * Patients receiving any other investigational products or who have received any other investigational product within 6 months of the study. * Patients who judged incompetent to give consent * Others judged by the investigator or co-investigator to be ineligible as subjects.