A 74-year-old man with recently diagnosed ventricular arrhythmias comes to your office for the initiation of amiodarone therapy. He has been diligently taking his current medications, which include warfarin and allopurinol. He denies any palpitations or chest pain at this time. He is happy with his current wellbeing and current medications. As part of patient education, you should caution this patient about which of the following side-effects of amiodarone?
