A 37-year-old man comes to the emergency room complaining of lightheadedness and palpitations for a few hours. He did some exercise in the gym and drank coffee just before his symptoms started. He drinks up to 5 cups of coffee a day, especially on the days he drives his truck for work. An electrocardiogram demonstrates a supraventricular tachycardia at a rate of 210 beats/minute. To interrupt his arrhythmia, you decided to use a medication that increases outward potassium current from myocytes. Of the following, which is true about this medication?
