ZOVIRAX 400mg Tablet contains Acyclovir, an antiviral medication that inhibits the replication of viruses such as herpes simplex virus (HSV) and varicella-zoster virus (VZV). By preventing viral replication, ZOVIRAX reduces the severity and duration of symptoms associated with infections like cold sores and chickenpox. Its efficacy in suppressing viral activity makes ZOVIRAX a trusted choice for antiviral treatment.