<prompt> Which antiviral drug is used in both HIV an hepatitis B:-AcyclovirAbacavirEmtricitabineEnfuviide  <response>: Drugs used in treatment of both HIV and Hepatitis B: Lamivudine Emtricitabine Tenofovir Acyclovir and Abacavir are protease inhibitors used in treatment of HIV. Enfuviritide is a Gp41 inhibitor, it inhibits the fusion of virus with host cell. 