Systematic Review: In people with Alzheimer’s disease and vascular dementia with agitation and psychosis, atypical antipsychotics probably reduce agitation slightly (moderate‐certainty evidence) but probably have a negligible effect on psychosis or risk of any adverse event.

Antipsychotics for agitation and psychosis in people with Alzheimer’s disease and vascular dementia – Cochrane Library

Summary: Do antipsychotic medicines reduce  agitated behaviour and psychotic symptoms in people with Alzheimer’s disease and vascular dementia? – Cochrane Library