Anti-microbial drugs (antibiotics) that contain fluoroquinolones, such as Avelox, Cipro and Levaquin, have warnings because they can increase the risk of tendinitis and tendon rupture, especially in
patients over 60 years old.
Beta blockers like Atenolol, Metoprolol
, Nadolol and Propronolol have a black box warning for patients to be supervised by a physician while discontinuing use of these drugs. Withdrawal can cause severe exacerbation of angina and myocardial infarction.