The chemical name of valaciclovir hydrochloride is: l-valine-2 - [(6-oxo-2-amino-1,6-dihydro-9h-purin-9-yl) methoxy] Ethyl ester hydrochloride, valaciclovir hydrochloride is the L-valine ester of acyclovir and the prodrug of acyclovir. It is hydrolyzed into acyclovir immediately after entering the body to exert its efficacy. It is used to treat varicella zoster and infection caused by type I and type II herpes simplex virus, including initial and recurrent genital herpes virus infection.