Valtoval 500 Tablet is an antiviral medicine used in the treatment of herpes labialis, genital herpes infection, and herpes zoster infections. It prevents the multiplication of viruses in human cells and clears up the infection. Valtoval 500 Tablet should be taken in the dose and duration as advised by your doctor. Do not skip any doses and finish the full course of treatment even if you feel better. It may be taken with or without food, but it is better to take it at a fixed time. You should drink plenty of water while on treatment with this medicine as it helps to prevent dehydration and kidney damage. Valtoval 500 Tablet may cause a few common side effects like headache, nausea, and stomach pain. Inform your doctor if these bother you or persist for a longer duration. Please consult your doctor if you are pregnant, planning to conceive, or breastfeeding.