This drug is used with other HIV medications to help control HIV infection. It helps to decrease the amount of HIV in your body so your immune system can work better. This lowers your chance of getting HIV complications and improves your quality of life. Atazanavir belongs to a class of drugs known as protease inhibitors. It may be given with certain other medications to increase the levels of atazanavir. This helps atazanavir work better. Atazanavir is not a cure for HIV infection. To decrease your risk of spreading HIV disease to others, continue to take all HIV medications exactly as prescribed by your doctor. Use an effective barrier method during sexual activity as directed by your doctor. Do not share personal items that may have contacted blood or other body fluids. Consult your doctor or pharmacist for more details.