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Dose of Valtrex for Shingles. For the treatment of cold sores (herpes labialis) in adults and children age 12 and older, the recommended dose is Valtrex 2000 mg (2 grams), twice a day, for one day.The two doses should be taken about 12 hours apart.s is always the case, do not adjust your dose unless your healthcare provider specifically instructs you to do so. For the treatment of shingles (herpes zoster) in adults, the recommended dose is Valtrex 1000 mg (1 gram) taken by mouth three times a day for seven days.
Valtrex's website recommends that the drug be taken once during the prodrome of a cold sore (the aura associated with cold sores that can include burning, itching or tingling feeling in the area) and then again 12 hours later. Antiviral treatment has not shown to be effective in treating cold sores after they occur.alacyclovir is used to shorten the duration and severity of shingles symptoms and to help stop new sores from forming. Valacyclovir should be started soon after the shingles rash appears and is taken is normally taken in a week-long regimen.