Valacyclovir

Valaciclovir (INN) or valacyclovir (USAN) is an antiviral drug used in the management of herpes simplex and herpes zoster (shingles). It is a prodrug, being converted in vivo to aciclovir. It is marketed by GlaxoSmithKline under the trade name Valtrex or Zelitrex.
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Valacyclovir /val·a·cy·clo·vir/ an ester of acyclovir, to which it is metabolized; used as the hydrochloride salt as an antiviral agent in the [more]Valacyclovir - Community and Resources

A substance that is being studied in the prevention of fungal, bacterial, and viral infections in patients undergoing donor stem cell transplantation with cells that are infected with cytomegalovirus. It belongs to the family of drugs called antivirals.