Antiviral agents are a class of pharmaceuticals designed to inhibit or prevent the replication and spread of viruses in infected cells, thereby reducing the severity and duration of viral infections. These compounds can act at various stages of the viral life cycle, from attachment to host cells to release of new virions. Common antiviral mechanisms include blocking viral entry into cells, inhibiting viral enzyme activity, or enhancing host cell defense responses. Antivirals are often used for treating specific viral diseases such as influenza, herpes, HIV/AIDS, and hepatitis. Some well-known examples include oseltamivir (Tamiflu) for influenza, acyclovir for herpes, and tenofovir for HIV. These medications can be administered orally, topically, or intravenously depending on the specific condition and route of administration. In medical practice, antiviral agents are critical in managing viral outbreaks and infections, providing a targeted approach to infection control and disease management.