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val·a·cy·clo·vir | \ ˌval-ə-ˈsī-klō-ˌvir 
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\Medical Definition of valacyclovir
: a prodrug of acyclovir that is administered orally in the form of its hydrochloride C13H20N6O4·HCl to treat shingles, genital herpes, and cold sores — see valtrex
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