A client with a diagnosis of Bipolar Disorder has been taking lithium carbonate; however, they stopped it 2 months ago because they “didn’t need it anymore.” The client is now talking in a loud voice, pacing, and flailing their arms in exaggerated gestures. The physician orders a “now dose” of lithium and olanzapine, a second-generation antipsychotic agent. The client’s family asks why olanzapine is ordered. What is the nurse’s most appropriate response?