A nurse is caring for a client who is experiencing delusions, hallucinations, and alterations in speech. Which of the following medications should the nurse anticipate the provider to prescribe?

Delusions, hallucinations, and disorganized speech are positive symptoms of psychosis, most classically associated with schizophrenia. The primary pharmacological treatment for psychotic symptoms involves dopamine antagonists, which include both typical antipsychotics such as haloperidol and atypical antipsychotics such as olanzapine and risperidone. Dopamine hyperactivity in the mesolimbic pathway is the predominant neurochemical hypothesis for positive psychotic symptoms, and dopamine antagonists work by blocking D2 receptors to reduce this hyperactivity. Mood stabilizers such as lithium or valproate are used for bipolar disorder and do not primarily address psychotic symptoms. Benzodiazepines may be used adjunctively for agitation in the acute setting but are not antipsychotic agents and do not target the core symptoms of schizophrenia. Selective serotonin reuptake inhibitors are first-line agents for depression and anxiety disorders, not for psychosis. Although some atypical antipsychotics have serotonin antagonist properties in addition to dopamine blockade, the classification of choice when psychosis is the primary presentation is the dopamine antagonist group. Recognizing the neurochemical basis of symptom clusters helps nurses anticipate the appropriate medication class.