Which adverse effect should a nurse prioritize monitoring for in a client taking first-generation antipsychotics?

Choice A reason: Anticholinergic effects, including xerostomia, blurred vision, and urinary retention, are common side effects of first-generation antipsychotics due to muscarinic receptor blockade. While uncomfortable and requiring management, they are generally not as acutely debilitating or socially stigmatizing as the severe motor dysfunctions associated with dopamine blockade in the nigrostriatal pathway. Choice B reason: Orthostatic hypotension occurs due to alpha-1 adrenergic blockade, leading to dizziness and a risk of falls, especially in the elderly. While a safety concern, it is a predictable side effect that can often be managed with gradual position changes, whereas EPS requires complex differential diagnosis and specific pharmacological reversal. Choice C reason: Nausea and vomiting are actually less common with first-generation antipsychotics because many of these agents, such as prochlorperazine or haloperidol, possess potent antiemetic properties by blocking dopamine receptors in the chemoreceptor trigger zone. Therefore, monitoring for gastrointestinal upset is not a clinical priority for this medication class. Choice D reason: Monitoring for EPS is the priority because these effects can be acute, painful, and potentially irreversible, as seen in tardive dyskinesia. EPS includes acute dystonia, akathisia, and pseudoparkinsonism. Early detection is vital to adjust dosages or administer anticholinergic agents like benztropine to prevent long-term neurological sequelae and maintain patient compliance.