Review Question - QID 210776

A 45-year-old woman presents to her primary care physician with complaints of weight loss and anxiety. She says that over the past 6 months she has lost 10 pounds even though she has had an increased appetite. In addition, she describes 3 episodes where it felt like her heart was "pounding out of her chest." Her temperature is 99.3°F (37.4°C), pulse is 106/min and regular, blood pressure is 141/80 mmHg, and respirations are 18/min. Physical exam is significant for mild bilateral proptosis and 3+ deep tendon reflexes bilaterally. Which of the following is the best initial therapy for the patient's condition?