Review Question - QID 213652

A 72-year-old man presents to the physician for his annual check-up. His blood pressure is 150/98 mmHg and his pulse is irregular at 124/min at rest. An electrocardiogram is performed and reveals the findings seen in Figure A. The remainder of his examination and laboratory tests are normal. The patient is started on a medication that the physician notes may cause a variety of adverse effects. Three months later, the patient returns to the physician with complaints of lethargy, weight gain, and cold intolerance. The physician surmises that his symptoms are due to a drug reaction of the medication prescribed at his previous visit. Which of the following may be another potential adverse effect of the medication prescribed for this patient?