List of products in the National Drug Code with proprietary name . Candesartan is used to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Candesartan belongs to a class of drugs called angiotensin receptor blockers (ARBs). It works by relaxing blood vessels so blood can flow more easily. This medication is also used to treat heart failure. This medication is not recommended for use in children younger than 1 year due to increased risk of side effects.