PLE-2036

A 29-year-old female presented with weight loss, palpitation, tremors, and heat intolerance. She is tachycardic at 115 bpm with the presence of moderate to severe proptosis. The thyroid gland is diffusely enlarged and non-tender. Reflexes are hyperactive. The rest of the examination is normal. Which of the following treatment options may worsen her proptosis?