mitral valve prolapse
"I have been on Tenormin for about 4 years. It certainly has taken care of the heart palpitations. I do not take any caffeine. But other side-effects have occurred: asthma has gotten worse,  I get winded after running only one and a half mile, more often than not, I feel tired, my hair is thinning, I have esophageal spasms, which I have read that Tenormin may induce upper GI problems. I am going off the medication to see if it makes a difference. I exercise regularly, and 7 years ago, my Doctor suggested I take Beta-Blockers, which I wasn't keen on, but since I exercise, he said it wasn't that imperative that I take it. So I'd rather run regularly, and efficiently and be off it."