Tenvir AF 25mg Tablet is an antiviral medication containing the active constituent Tenofovir alafenamide. It is used to treat chronic hepatitis B virus (HBV) infection. Hepatitis B is an infection affecting the liver caused by the hepatitis B virus. Discuss with your doctor about the precautions needed to avoid infecting others. Tell your doctor if you have or have ever had kidney diseases, liver diseases, or HIV before taking Tenvir AF 25mg Tablet. Administration of this medicine may lead to lactic acidosis (accumulation of excessive acid) and hepatomegaly (enlarged liver).