Tenvir is a treatment for Human Immunodeficiency Virus (HIV) infection in adults over 18 years of age and/or for chronic hepatitis B an infection with hepatitis B virus (HBV) in adults. To prevent the virus become resistant, tenofovir should always be given in combination with other antiretrovirals when treating HIV. It is used to treat HIV infection and chronic hepatitis B virus (HBV) infection in combination with other anti-HIV Medicine. It prevents the multiplication of virus in human cells. This stops the virus from producing new viruses and clears up your infection.