Valacyclovir is a guanosine analogue and a potent antiviral drug of low toxicity. It is fundamentally an oral prodrug of acyclovir that is converted extensively and almost fully to acyclovir (the active drug) and L-valine. Pharmacologically, it is an L-valyl ester. Approximately 54% to 60% of the medication dose is available as active acyclovir, representing a twofold to fivefold increase in bioavailability over that achieved administration of oral acyclovir. Valacyclovir is used for herpes treatment, varicella zoster infection and infection caused by cytomegaloviruses. It was mainly developed to increase the oral absorption and plasma levels of acyclovir so that antiviral activity is sufficiently maintained in immunocompromised patients and in curing lesions by less sensitive viruses such as VZV and CMV. It is mainly available as Valtrex. Many patients with viral lesions have found significant improvement and healing of their condition owing this valtrex pill online also.