Valtrex 500mg tablets contain Valaciclovir, an antiviral medication used to treat various viral infections. Each pack contains 10 tablets of 500mg strength. This prescription medication is manufactured by GSK and requires medical supervision for use. Valtrex (Valaciclovir) works by stopping the growth and spread of certain viruses in the body. The tablets should be taken exactly as prescribed by your healthcare provider. The dosage and duration of treatment will depend on the specific condition being treated. Store the medication in a cool, dry place away from direct sunlight and keep out of reach of children. Always complete the full course of treatment as prescribed, even if symptoms improve.