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?

Choice A reason: Dystonia is an extrapyramidal side effect of haloperidol, characterized by involuntary muscle contractions, often affecting the neck, face, or back. It can be severe and requires prompt treatment with anticholinergic medications such as benztropine. Choice B reason: Increased agitation may occur in some psychiatric conditions but is not a primary adverse effect of haloperidol. The drug is intended to reduce agitation and psychotic symptoms. Choice C reason: Excess salivation is more commonly associated with clozapine, not haloperidol. This is not a typical adverse effect of haloperidol. Choice D reason: Diarrhea is not a recognized adverse effect of haloperidol. Gastrointestinal side effects are rare with this medication.