A 48-year-old woman with polymyositis began taking prednisone 60 mg daily 6 months ago

A 48-year-old woman with polymyositis began taking prednisone 60 mg daily 6 months ago. Her initial creatine kinase (CK) level was 7,028 U/L (reference range prednisone dose has been decreased to 20 mg. She still has signifi cant proximal muscle weakness. What would be the best course of action at this time to improve her muscle strength? a. Increase the dose of prednisone. b. Continue to decrease the prednisone dose and have her begin physical therapy. c. Begin methotrexate. d. Begin azathioprine. e. Begin intravenous immune globulin.