Angiotensin II Receptor Blockers (ARBs) are a class of medications used primarily to treat high blood pressure and heart failure. They work by blocking the action of angiotensin II, a hormone that causes blood vessels to constrict, leading to increased blood pressure. By inhibiting this hormone, ARBs help relax blood vessels, making it easier for the heart to pump blood. Common examples of ARBs include losartan, valsartan, and irbesartan. These medications are often prescribed when patients cannot tolerate ACE inhibitors, another type of blood pressure medication. ARBs are generally well-tolerated, with fewer side effects related to cough compared to ACE inhibitors.