Valtrex 500mg tablets contain valaciclovir, an antiviral medication used to treat various viral infections. Each pack contains 10 tablets, with each tablet containing 500mg of the active ingredient valaciclovir. This is a prescription medication that works by stopping the growth and spread of certain viruses in the body. The tablets should be taken as prescribed by a healthcare provider, and the full course of treatment should be completed even if symptoms improve. Store in a cool, dry place away from direct sunlight and keep out of reach of children. Consult your doctor before use, especially if you have kidney problems or are pregnant/breastfeeding.