Cozaar (losartan) belongs to a group of drugs called angiotensin II receptor antagonists. Losartan keeps blood vessels from narrowing, which lowers blood pressure and improves blood flow.

Cozaar is used to treat high blood pressure (hypertension). It is also used to lower the risk of stroke in certain people with heart disease.

Cozaar is used to slow long-term kidney damage in people with type 2 diabetes who also have high blood pressure.