Abstract Background Although agitation in Alzheimer’s Disease (Agit-AD) is a common and troubling neuropsychiatric syndrome, behavioral interventions lack consistent efficacy and there are no FDA-approved medications. Neurobiological mechanisms that contribute to Agit-AD include brain atrophy, degradation of neurotransmission, neuroinflammation, disrupted circadian rhythms, comorbidities and frailty. Agit-AD is a major source of disease progression, patient disability, financial burden, and caregiver stress. Dronabinol is synthetic tetrahydrocannabinol (THC, one of the predominant biochemical constituents of cannabis). Cannabinoids may improve Agit-AD by providing protection against neuroinflammation and excitotoxicity, regulating neurotransmitters, improving comorbidities, stabilizing circadian rhythms, and increasing cerebral blood flow. Method THC-AD is a three-week placebo-controlled, double-blind, RCT...