Long Term, Extension Study of the Safety and Efficacy of AVP-786 for the Treatment of Agitation in Patients With Dementia of the Alzheimer's Type

Inclusion Criteria: * Participant has successfully completed Studies 15-AVP-786-301, 15-AVP-786-302, 12-AVR-131, or 17-AVP-786-305. (Note: A delay in enrollment may include delays associated with COVID-19 restrictions.) * Participants with a diagnosis of probable Alzheimer's Disease (AD) according to the 2011 National Institute on Aging-Alzheimer's Association (NIA-AA) working group criteria * Either out-patients or residents of an assisted-living facility or a skilled nursing home * Participants who delay enrollment must have clinically significant, moderate/severe agitation at least 2 weeks prior to baseline * Participants who delay enrollment must have a diagnosis of agitation that must meet the International Psychogeriatric Association (IPA) provisional definition of agitation * Participants who delay enrollment must have a Clinical Global Impression of Severity of Illness (CGIS) score assessing Agitation of ≥ 4 (moderately ill) at screening and baseline * Participants who delay enrollment must have a Mini-Mental State Examination (MMSE) score between 6 and 26 (inclusive) at screening and baseline Exclusion Criteria: * Participants with co-existent clinically significant or unstable systemic diseases that could confound the interpretation of the safety results of the study (e.g., malignancy, poorly controlled diabetes, poorly controlled hypertension, unstable pulmonary, renal or hepatic disease, unstable ischemic cardiac disease, dilated cardiomyopathy, or unstable val…