Final answer:
The practical nurse can evaluate the effectiveness of haloperidol (Haldol) by observing the client's symptoms and behavior, such as improvements in psychotic symptoms and a decrease in agitation and aggression.
Step-by-step explanation:
The practical nurse can evaluate the effectiveness of haloperidol (Haldol) by observing the client's symptoms and behavior. They should look for improvements in psychotic symptoms such as hallucinations, delusions, and disorganized thinking. The nurse should also assess for a decrease in agitation, restlessness, and aggressive behavior. By monitoring these aspects, the nurse can determine if the medication is effectively reducing the client's symptoms.