Adefovir Dipivoxil works by blocking reverse transcriptase, an enzyme that is crucial for the hepatitis B virus (HBV) to reproduce in the body. Target: NRTIs; HBV Adefovir Dipivoxil works by blocking reverse transcriptase, an enzyme that is crucial for the hepatitis B virus (HBV) to reproduce in the body. Adefovir Dipivoxil is used for treatment of hepatitis B and herpes simplex virus infection [1-3]. Adefovir Dipivoxil is approved for the treatment of chronic hepatitis B in adults with evidence of active viral replication and either evidence of persistent elevations in serum aminotransferases (primarily ALT) or histologically active disease. Adefovir Dipivoxil is a failed treatment for HIV[3, 4].