Escitalopram Treatment for BPSD in Alzheimer's Disease in Comparison to Risperidone

Inclusion Criteria: Eligible participants will fulfill criteria for dementia of the Alzheimer's type (according to the Diagnostic and Statistical Manual of Mental Disorders, fourth edition). The score on the Mini-Mental State Examination (MMSE) has to be between 5 and 26. Eligible patients will suffer from delusions, hallucinations, aggression, or agitation that developed after the onset of dementia and is severe enough to disrupt their functioning and, in the opinion of the study physicians, to justify treatment with antipsychotic drugs. Signs and symptoms of psychosis, aggression, or agitation will have to occur nearly daily during the week prior to enrollment. A frequency rating of "often" or "more frequently" and a severity rating of at least "moderate" are required for delusions, hallucinations, agitation, or "aberrant motor behavior" in the Neuropsychiatric Inventory (NPI). Exclusion Criteria: Patients will be excluded if they had received a diagnosis of a primary psychotic disorder (e.g., schizophrenia), delirium, other dementia. Patients will also be excluded if they were going to receive treatment with a cholinesterase inhibitor or antidepressant medication, had previously been treated with escitalopram for BPSD, or had contraindications to the two study drugs.