EPCLUSA, when taken with amiodarone (Cordarone®, Nexterone®, Pacerone®), a medicine used to treat certain heart problems, may cause slow heart rate. In some cases slow heart rate has led to death or the need for a pacemaker when amiodarone is taken with medicines containing sofosbuvir. Get medical help right away if you take amiodarone with EPCLUSA and get any of the following symptoms: fainting or near-fainting, dizziness or lightheadedness, not feeling well, weakness, extreme tiredness, shortness of breath, chest pains, confusion, or memory problems. The most common side effects of EPCLUSA in adults include headache and tiredness.