Q. A 28-year-old female patient presents with a 3-month history of palpitations, weight loss, tremors, and increased sweating. A diffusely enlarged thyroid gland and modest proptosis are found during a physical examination. Laboratory tests reveal a decreased level of thyroid-stimulating hormone and increased free thyroxine and triiodothyronine. In addition, levels of thyroid-stimulating immunoglobulin are increased. Graves' disease is identified as the cause. What is the appropriate management?