A 57-year-old woman is complaining of frequent headaches and scalp tenderness. She also has arthralgias, fatigue, and discomfort in her jaw when she chews. On examination, her head and neck is normal, but the right temporal artery is tender on palpation. Her erythrocyte sedimentation rate (ESR) is 50 mm/h and hemoglobin 10.5 g/dL. A temporal artery biopsy is obtained for diagnostic confirmation. Which of the following is the most appropriate next step in management?