Which assessment finding requires immediate intervention for a client taking antipsychotic medications?

Sudden confusion in a client taking antipsychotic medications indicates a potential medical emergency, such as an adverse effect of the medication or an underlying condition such as neuroleptic malignant syndrome (NMS) or severe anticholinergic effects. Antipsychotics can cause alterations in mental status, and sudden onset confusion could signal a serious issue requiring prompt evaluation and intervention.

This is especially critical because early recognition and treatment of complications can mitigate risks of more severe consequences. While excessive salivation, severe headache, and frequent hallucinations may indicate issues related to medication management or side effects, sudden confusion stands out as a more immediate concern that could reflect significant neurological distress or other urgent medical problems that need attention right away.