<prompt> Drug effective against both hepatitis B as well as HIV isAcyclovirFoscarnetLamivudineCidofovir  <response>: Lamivudine is NI used in both HIV and hepatitis B low dose.Lamivudine is effective in chronic hepatitis B;this is due to longer intracellular t12 of lamivudine in HBV infected cells than in HIV infected cells. Acyclovir - effective against HSV-1HSV-2VZVEBV. Foscarnet -effective against H.simplex,CMV,other herpes group viruses and HIV. Cidovofir- effective against HSV,CMV,pox and adenoviruses. 