Valaciclovir (INN) or valacyclovir (USAN) is an antiviral drug used in the management of herpes simplex herpes zoster (shingles) and herpes B. It is a prodrug being converted in vivo to aciclovir. It is marketed by GlaxoSmithKline under the trade names Valtrex and Zelitrex. Valaciclovir has been available as a generic drug in the U.S. since November 25 2009.
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