Acivir-800 DT Tablet is used to treat viral infections. It contains Aciclovir, which prevents the multiplication of viruses, resulting in decreased viral overload. In some cases, you may experience side effects such as headaches, dizziness, nausea or vomiting, diarrhoea, rash, and skin sensitivity to sunlight. Before starting Acivir-800 DT Tablet, inform your doctor if you are pregnant, breastfeeding, taking any other medicines or have pre-existing medical conditions.