A Study to Assess the Safety and Efficacy of the of the Gastric-retentive AP-CD/LD in Advanced Parkinson's Patients

A multi-center, global, randomized, double-blind, double-dummy, active-controlled, parallel-group study in adult subjects with fluctuating PD. The study will have 2 open label Titration periods of 6 weeks each prior to the double blind Maintenance period. In the open label periods all patients will be stabilized on the active comparator Sinemet® and then on AP-CD/LD. The double blind Maintenance period will be 13 weeks long.