MSFinals-5001

A 65-year-old man presents for a medication review after being discharged from the hospital three months ago following a cholecystectomy. He was started on new medications for hypertension and atrial fibrillation. Despite feeling well, he has noticed ankle swelling and suspects it may be a side effect of one of the new medications. During examination, his blood pressure is 124/82 mmHg, and his heart rate is 68/min irregularly irregular. Which medication is most likely causing this side effect?