A 50-year-old woman with a 12-month history of ventricular tachycardia comes to the physician for ringing of the ears, dizziness, and headache. She started taking an oral anti-arrhythmic agent 4 months ago. Her platelet count is 90,000/μL. Which of the following is the most likely explanation for these findings?
Amiodarone
Flecainide
Ibutilide
Procainamide
Quinidine
