Please follow your doctors instructions regarding the dosage and duration of Zovirax 400 Tablet It is important not to miss any doses and complete the full course of treatment even if you start feeling better Dissolve the tablet in a glass of water before taking it You can take it with or without food but it is recommended to take it at the same time every day If you forget to take a dose take it as soon as possible However if it is almost time for your next dose skip the missed dose and continue with your regular schedule Do not take a double dose to make up for the missed one It is advisable to drink plenty of water while on this medication to prevent dehydration and kidney damage Some side effects of Zovirax 400 Tablet may include headache dizziness vomiting nausea fatigue and fever If these side effects persist or become worse please inform your doctor If you are pregnant planning to conceive or breastfeeding please consult your doctor before taking this medicine