Irovel 150mg Tablets 30’s contain Irbesartan 150mg and Hydrochlorothiazide 12.5mg which treat high blood pressure. It 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. Also, hydrochlorothiazide is a diuretic that removes extra water and certain electrolytes from the body. Over time it also relaxes blood vessels and improves blood flow.