Buy Valcivir 500mg is converted into acyclovir by liver. Acyclovir then blocks the DNA polymerase enzyme, inhibiting the viral DNA replication. The process of cell growth and division stops and the cell is not able to spread in the whole body and this finally helps to heal the symptoms of infection and prepare the body to fight off the infections. Valacyclovir does not cure the herpes infection, as the virus can lie dormant in the body for a very long time and can re-attack once.