Clinical Evaluation of Ropinirole PR/XR Tablets in Monotherapy for Parkinson's Disease (PD)

Subjects will take the investigational drug once daily at the same time each day, it is recommended that this is in the morning for optimal benefit. Investigational drug is taken for 52 weeks, starting on the next day of the Week 0 visit. One tablet of ropinirole PR/XR 2 mg tablets will be orally dosed as the initial dose. The dose will be titrated weekly by 2 mg/day, and increased to 8 mg/day in Week 4. From Week 5 up to 16, the dose will be increased at minimum intervals of one week between titration steps until sufficient efficacy is obtained, according to individual clinical response and tolerability (the dose may be titrated up to 16 mg/day). In Week 16 and further, treatment dose at Week 16 will be continuously administered up to Week 52. If insufficient efficacy is judged in a subject during treatment, or unable to maintain the dose due to adverse event, the treatment dose may be changed. The dose is down tapered according to the maintenance dose at Week 52 (or withdrawal).