<qa>  What is the name of the drug approved by the Food and Drug Administration?This research study is being conducted to compare the safety and effectiveness of the investigational medication, LdT telbivudine versus adefovir dipivoxil, a drug approved by the Food and Drug Administration FDA for the treatment of hepatitis B infection. The results for patients taking LdT will be compared to results for patients taking adefovir dipivoxil. 