Respected Ma m / Sir Thanks for writing to us. If you essentially have normal rhythm with no symptoms arising from it and you do not have a structural heart disease on cardiac sonogram, then you need only to know why this heart rate is high and drug therapy is not mandatory at all. The causes in such a scenario include thyroid hormone problems, anxiety, stress, anti-cold/asthma medications, tea/coffee intake, certain kind of spices etc. You may consult an electrophysiologist/ cardiologist for a second opinion as beta-blockers are causing to side-effects worse than the original problem. sincerely sukhvinder singh