Valtrex 500mg is a prescription medication containing valaciclovir hydrochloride as the active ingredient. Each pack contains 42 tablets, with each tablet containing 500mg of valaciclovir. This medication is manufactured by GSK (GlaxoSmithKline). Each tablet contains 500mg of valaciclovir in the form of valaciclovir hydrochloride. The product comes in a blue box containing 42 tablets.