In a meta-analysis, lowering of heart rate was associated with increases in cardiac mortality, risk for nonfatal MI (Myocardial Infarction), and heart failure.
— Mark S. Link, MD
Published in Journal Watch Cardiology December 10, 2008
A review of 22 studies published in the medical journal The Lancet in January may suggest another reason to be wary of beta-blockers for high blood pressure. The review concluded that diuretics and beta-blocker treatments may increase the chances of developing type 2 diabetes.
http://www.news-medical.net/?id=22051