Antiviral drugs are specifically designed to inhibit viral replication and control infections caused by viruses such as influenza, hepatitis, herpes, and HIV. These medications block viral enzymes, prevent virus entry into cells, and enhance the immune response, helping to reduce symptom severity, shorten recovery time, and lower transmission risk. Antiviral therapies are essential for managing acute and chronic viral conditions, preventing complications, and improving overall health outcomes in infected individuals.