Warning:If you have hepatitis B virus infection (HBV; an ongoing liver infection) and you take tenofovir alafenamide (AF), your condition may suddenly worsen when you stop taking this medication. Be careful not to miss doses or run out of tenofovir AF. Your doctor may test you to see if you have HBV before you begin your treatment with tenofovir AF. Your doctor will examine you and order lab tests regularly for several months after you stop taking this medication. Tell your doctor if you experience any new or unusual symptoms after you stop taking tenofovir AF.

Tenofovir alafenamide (AF) is used to treat chronic (long term) hepatitis B virus (HBV) infection. Tenofovir is in a class of medications called nucleoside reverse transcriptase inhibitors (NRTIs). It works by decreasing the amount of HBV in the blood. Tenofovir AF will not cure hepatitis B and may not prevent complications of chronic hepatitis B. Tenofovir AF may not prevent the spread of hepatitis B to other people.

For more information on Vemlidy (Tenofovir alafenamide), click here.