Antiviral drugs are medications specifically designed to treat viral infections. Unlike antibiotics, which target bacteria, antiviral drugs work by inhibiting the development and replication of viruses. They can help reduce the severity and duration of illnesses caused by viruses such as influenza, HIV, and herpes. These drugs can be used to prevent infections in high-risk individuals or to treat active infections. Some common antiviral medications include oseltamivir for the flu and acyclovir for herpes. While they can be effective, antiviral drugs are not a cure for viral infections and are most effective when taken early in the course of the illness.