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If Valtrex prevents the spread of the herpes virus family. Your genital herpes outbreaks as they happen, the standard dose of Valaciclovir is 500 mg twice daily for 3 days. Valtrex is most effective if it is started within 48 hours of when the rash first appears. Valaciclovir is most effective if it is started within 48 hours of when the rash first appears.