I have been having trouble with an irregular heart beat that is symptomatic. I am taking 12.5mg of metoprolol and the doctor just added an antiarrhythmic drug and I am worried after reading the side effects. I am otherwise healthy and do not have any underlying heart disease or problems. I have been through most cardiac tests.
Hello! Welcome and thank you for asking on Chat Doctor! I would like to have some more information on the antiarrhythmic Chat Doctor.  What are your actual heart rate values while taking metoprolol? I am glad that your cardiac tests have resulted normal. Nevertheless, I would recommend performing further tests to investigate for the possible cause of your irregular heart rate