Overview Safety and Efficacy Study Evaluating Dimebon in Patients With Mild to Moderate Alzheimer's Disease on Donepezil Status: Completed Trial end date: 2011-12-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine if Dimebon is safe and effective in patients with mild to moderate Alzheimer's disease on Donepezil. Phase: Phase 3 Details Lead Sponsor: Medivation, Inc.Collaborator: PfizerTreatments: Donepezil