tenofovir disoproxil, sold under the trade name viread among others, is a medication used to treat chronic hepatitis b and to prevent and treat hiv/aids. it is generally recommended for use with other antiretrovirals. it may be used for prevention of hiv/aids among those at high risk before exposure, and after a needlestick injury or other potential exposure. it is sold both by itself and together as emtricitabine/tenofovir and efavirenz/emtricitabine/tenofovir. it does not cure hiv/aids or hepatitis b. it is available by mouth as a tablet or powder.