Tenofovir alafenamide, which is present in Tefod 25mg Tablets, is used to treat chronic hepatitis B infection, a viral liver illness. It functions by halting or delaying the virus's development. Liver cancer and significant liver damage (cirrhosis) can result from a persistent hepatitis infection.Tenofovir alafenamide may help treat hepatitis B, but it may also make it harder for you to spread the virus to other people. Use latex condoms or other "safer sex" practices to reduce the chance of spreading the infection to other people.