Olmesartan & Chlorthalidone belongs to the class of medicines called ‘Anti-hypertensive’, primarily used to treat hypertension (high blood pressure). Hypertension or high blood pressure is a chronic condition in which the force exerted by the blood against the artery wall is high. As a result, it leads to heart disease, irregular heartbeat, and other complications. Olmesartan & Chlorthalidone is a combination of two medicines: Olmesartan and Chlorthalidone. Olmesartan is an angiotensin receptor blocker (ARB) that works by blocking the hormone angiotensin, thereby relaxing blood vessels. This allows the blood to flow more smoothly and the heart to pump more efficiently. On the other hand, Chlorthalidone is a diuretic or water pill that removes extra water and certain electrolytes from the body. Together it lowers fluid overload and blood pressure and improves blood flow.