A nurse is planning to administer haloperidol to a client who has acute psychosis. The nurse should monitor the client for which of the following findings as an adverse effect of the medication?

A. Dystonia, a type of extrapyramidal symptom (EPS), is a common adverse effect of haloperidol, especially during the early phase of treatment. It involves involuntary muscle contractions, often affecting the neck, face, or eyes. B. Diarrhea is not a typical adverse effect of haloperidol; constipation is more likely due to its anticholinergic properties. C. Excess salivation is more commonly associated with other medications such as clozapine. Haloperidol may cause dry mouth instead. D. Increased agitation may occur in rare cases but is not a common or expected adverse effect; haloperidol is generally used to reduce agitation in acute psychosis.