An Extension of Istradefylline in Parkinson's Disease Patients Who Have Completed Studies 6002-EU-007, 6002-US-013 or 6002-US-018

This is a 1-year, open-label, long-term safety extension for patients who have completed prior istradefylline studies 6002-EU-007, 6002-US-013 or 6002-US-018.

Patients with Parkinson's disease with motor complications on levodopa therapy who completed the prior double-blind studies 6002-EU-007, 6002-US-013 or 6002-US-018 are eligible to enter into this 1-year, long-term open safety study with a starting istradefylline dose of 40mg per day.