The psychiatric-mental health nurse practitioner evaluates an 81-year-old man who was admitted to the hospital 3 days ago for community-acquired pneumonia and dehydration. Today, he has an altered level of consciousness and is only oriented to person. The nurses report he has become withdrawn and has refused to eat. He has no previous psychiatric history. Based on this scenario, what medication should the PMHNP prescribe for agitation as needed?

Choice A reason: Benztropine is primarily used to treat extrapyramidal symptoms from antipsychotic medications and does not address agitation in delirium. Choice B reason: Diphenhydramine may cause sedation but has anticholinergic properties that can worsen delirium in elderly patients, making it inappropriate. Choice C reason: Lorazepam can exacerbate delirium in older adults and is generally avoided unless agitation is due to alcohol or benzodiazepine withdrawal. Choice D reason: This choice is correct because haloperidol is the preferred first-line antipsychotic for acute agitation in elderly patients with delirium. It has minimal anticholinergic effects and can safely manage agitation while monitoring for extrapyramidal or cardiac side effects.