List of products in the National Drug Code with proprietary name . This drug is used to increase ("boost") the levels of certain HIV protease inhibitors (atazanavir and darunavir). This helps them work better to help control HIV infection. Cobicistat is not a cure for HIV infection. To decrease your risk of spreading HIV disease to others, do all of the following: (1) continue to take all HIV medications exactly as prescribed by your doctor, (2) always use an effective barrier method (latex or polyurethane condoms/dental dams) during all sexual activity, and (3) do not share personal items (such as needles/syringes, toothbrushes, and razors) that may have contacted blood or other body fluids. Consult your doctor or pharmacist for more details.