Antiviral Drugs Nucleoside and nucleotide analogs Phosphate enzyme thymidine Incorporated int。DNA Guanine DNA polymerase Nucleoside (b] Synthesis of normal viral DNA guanine nucleotide Phosphate Viral /midi DNA polymerase blocked by false nucleotide. Assembly False nucleotide of DNA stops (acyclovir triphosphate) Acyclovir (c) Synthesis of false viral DNA nucleotide with acyclovir