Lamivudine is used for Hiv Infection, Hepatitis B Virus Infection and other conditions,Lamivudine is used for the treatment, control, prevention, & improvement of the following diseases, conditions and symptoms: Hiv Infection, Hepatitis B Virus Infection.Lamivudine Working, Mechanism of Action and Pharmacology , Lamivudine improves the patient's condition by Increasing the number of infection fighting cells in the body.