question: Thanks, I was prescribe XAREL 20 Mg 1 per day w/food. I have a irregular heart beat. Told I have A-FibI take Atenol-Chlort 100mg - 25mg. now. Had to go to ER with very irregular heart beat and 165 per min.Would not go down. Was in ER for 6 hours. Went to heart Dr. today, could not get any of my questions answered. Can you help me with some answers. History of irregular heart beat in my family. Thank you,