Acicmon-400 are a prescription antiviral medication used to treat infections caused by the herpes simplex and varicella zoster viruses, such as genital herpes, cold sores, shingles, and chickenpox. “IP” stands for Indian Pharmacopoeia, indicating the drug meets the standards set by the Indian government. Aciclovir 400 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. Dissolve it in a glass of water before taking it. It may be taken with or without food, but it is better to take it at a fixed time. If you miss a dose, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose. You should drink plenty of water while on treatment with this medicine, as it helps to prevent dehydration and kidney damage.