This belongs to a class of drugs known as the Angiotensin II Receptor Blockers [ARBs], and is used to treat hypertension and heart failure. Valsartan acts on a chemical known as angiotensin II [AT2] that leads to narrowing of the blood vessels. Valsartan prevents the constriction of the blood vessels, which leads to easier flow of blood and oxygen to the body. This lowers high blood pressure, and eases the burden on the heart, enabling it to function smoothly.