Diovan (Generic name: Valsartan) is a prescription drug and is used to treat high blood pressure either as a monotherapy or in combination with other drugs. It may also be prescribed to patients with heart failure and are unable to tolerate ACE (angiotensin-converting enzyme) inhibitors. Valsartan Diovan medicine is an Angiotensin II receptor antagonist used to treat high blood pressure. It may also be used to treat congestive heart failure and other conditions as determined by your doctor.