Cozaar (losartan) and atenolol are used to treat hypertension. Atenolol is also used to treat chest pain (angina), for management of acute heart attack (myocardial infarction), and occasionally for thyroid storm management. Cozaar and atenolol belong to different drug classes. Cozaar is an angiotensin receptor blocker (ARB) and atenolol is a beta-blocker.

Beta blockers are a class of drug used for treating abnormal heart rhythms, angina, high blood pressure, migraine, anxiety, and more. Side effects of beta blockers include diarrhea, stomach cramps, nausea and vomiting, rash, blurred vision, muscle cramps, and fatigue, although they are generally well tolerated.