Study Type : Interventional (Clinical Trial) Actual Enrollment : 132 participants Allocation: Randomized Intervention Model: Parallel Assignment Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor) Primary Purpose: Treatment Official Title: A Phase 2, Double-Blind, Randomized, Placebo-Controlled Study to Evaluate the Safety, Tolerability, and Efficacy of ANAVEX2-73 for Cognitive Impairment in Patients With Parkinson's Disease With Dementia Actual Study Start Date : July 9, 2018 Actual Primary Completion Date : September 30, 2020 Actual Study Completion Date : September 30, 2020 Resource links provided by the National Library of Medicine MedlinePlus Genetics related topics: Parkinson disease MedlinePlus related topics: Dementia Parkinson's Disease U.S. FDA Resources