I've been on beta-blockers for 5 years. I'm 33 now. My doctor put my on beta-blockers for hypertension, and a fairly high heart rate. On the beta-blockers I may have developed Peyronie's Disease, so the doctor took me off of the beta-blockers last week. I was on atenolol 25mg, once a day. He told me to stop the beta-blocker cold turkey and take an ACE Inhibitor. The ACE Inhibitor is keeping the blood pressure normal, about 118/78. But the heart rate is 85 to 110 when sitting. Mostly it's 80 and 90's when sitting, but sometimes it hits 100 or more. The heart feels more rapid when up moving around and doing things. He told me to stop the atenolol right away, but I took 12.5 for 4 days, and now I haven't taken any for 3 days.
Is this level of tachycardia dangerous?