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Valtrex contains valaciclovir, an antiviral medication used to treat infections caused by herpes viruses. It is commonly prescribed for shingles (herpes zoster), cold sores (herpes labialis), and genital herpes. Valaciclovir is a prodrug that is converted into acyclovir in the body, which inhibits the replication of the virus. It is highly effective in reducing the duration of symptoms and accelerating the healing process of skin lesions. This medication should be used under medical supervision to ensure appropriate dosage based on the specific viral condition being treated.