How Quickly Does Valtrex Work?


Quick Answer

Patients taking Valtrex often notice an improvement of symptoms after first taking the medication, according to the Physician's Desk Reference. It is important to note that each patient responds to medications differently, and results depend on which ailment Valtrex is being used to treat.

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Full Answer

Valtrex is the brand name for the antiviral drug valacyclovir. This medication is used to treat cold sores, shingles, chickenpox and genital herpes. Treatment for an initial outbreak of genital herpes usually takes 10 days, and the regimen for shingles typically lasts a week, according to Mayo Clinic. Taking Valtrex within 24 to 48 hours of the first symptoms helps the effectiveness of this medication, as noted by the Physician's Desk Reference.

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