Telbivudin- 5 '- trifosfat hæmmer HBV- DNA- polymerase (revers transkriptase) ved at konkurrere med det naturlige substrat, tymidin 5' - trifosfat.
Telbivudine-5'-triphosphate inhibits HBV DNA polymerase (reverse transcriptase) by competing with the natural substrate, thymidine 5'-triphosphate.