HAYWARD, Calif.--(BUSINESS WIRE)--Impax Pharmaceuticals, the brand products division of Impax Laboratories, Inc. (NASDAQ: IPXL), today announced that it has completed enrollment of its APEX-PD trial. APEX-PD is a multinational Phase III trial of its late-stage drug candidate IPX066 in subjects with early Parkinson’s disease (PD). IPX066 is an investigational extended release carbidopa-levodopa product intended to rapidly achieve and sustain effective blood concentrations of levodopa, potentially improving PD clinical symptom management. This is the first of two Phase III studies designed to support marketing approval of IPX066 in Parkinson’s disease.