Respected Dr. Sir, I am CVG Pal, Aged 61 years. I am having Palpitations & B.P for the last 15 years. First started with Propranolol 40 mg for 3 yrs. & afterward, I have used Atenolol 25 for 5 yrs. Then using Aten 50 mg. for 5 years. Now for the last 2 yrs. Aten 50, daily 2 tablets ( morning & evening). Since I am having B.P. of 150/100 for sometimes, the doctor has prescribed Atenolol M 50 mg & Atenolol 50 mg. ( daily 2 tablets (morning & evening). Now I am afraid of any problems. Kindly help & advice me sir. my email i.d., YYYY@YYYY Please sir.