A 33-year-old female diagnosed with bipolar I disorder has been functioning well on lithium for 11 months. At her most recent checkup, the psychiatric nurse practitioner states, 'You are ready to enter the maintenance therapy stage, so at this time I am going to adjust your dosage by prescribing:'
Correct Answer: C
Rationale: As the patient transitions to maintenance therapy, the typical approach involves decreasing the dosage to a lower level. This adjustment is made to find the minimum effective dose needed for symptom control while reducing the potential side effects associated with long-term use. Choosing a higher dosage (A) would not align with the goal of maintenance therapy, as it may increase the risk of adverse effects. Once-a-week dosing (B) is not a common adjustment for lithium, which is usually prescribed daily for bipolar disorder. Switching to a different drug (D) is typically considered if the current medication is ineffective or intolerable, not as a routine step in transitioning to maintenance therapy.