A nurse in an acute mental health care facility is prioritizing care for multiple clients. Which of the following clients should the nurse see first?

A client taking clozapine who reports a sore throat must be seen first because this is a potential sign of agranulocytosis — a life-threatening drop in neutrophils that is a known adverse effect of clozapine. This requires immediate assessment and WBC/ANC laboratory testing. While the other clients' needs are important, none present an immediately life-threatening risk like agranulocytosis.