Study Evaluating Intepirdine (RVT-101) in Subjects With Mild to Moderate Alzheimer's Disease on Donepezil: MINDSET Study

Inclusion Criteria: * Male or female subject with AD * Ongoing donepezil therapy for AD * An MMSE score 12 to 24 inclusive at Screening; MMSE score 10-26 inclusive at Baseline * Hachinski Ischaemia score less than or equal to 4 at Screening. * If female, subject must be: a. of non-childbearing potential or surgically sterile; or, b. willing to use an adequate methods of birth control. Male subjects who are sexually active will also be required to use an adequate form of birth control. * Subject has the ability to comply with procedures for cognitive and other testing in the opinion of the investigator. * Subject has a reliable caregiver who is willing to report on subject's status throughout the study. Exclusion Criteria: Other Causes for Dementia * Diagnosis of vascular dementia * Atypical clinical features or clinical course of dementia that would lead the investigator to conclude symptoms are more likely due to an alternate dementia diagnosis including, but not limited to, frontotemporal dementia, Lewy body dementia, or others. Confounding Medical Conditions * History of significant psychiatric illness such as schizophrenia or bipolar affective disorder or any other significant psychiatric illness that in the opinion of the investigator would interfere with participation in the study; * Any clinically relevant concomitant disease, which, in the opinion of the investigator, makes the subject unsuitable for inclusion in the study.