Emtricitabine and tenofovir are antiviral medicines that prevent human immunodeficiency virus (hiv) from multiplying in your body. Emtricitabine and tenofovir is a combination medicine used to treat hiv, the virus that can cause acquired immunodeficiency syndrome (aids). Taferoem to treat hiv infection in adults and children who weigh at least 37 pounds (17 kilograms). Taferoem is used to treat hiv infection, the medicine is always used in combination with other hiv medicines.