Antiviral therapy refers to the use of medications to treat viral infections. These drugs work by inhibiting the ability of viruses to replicate and spread within the body. Common antiviral medications include acyclovir for herpes viruses and oseltamivir for influenza. This type of therapy is essential for managing various viral diseases, including HIV/AIDS, hepatitis, and COVID-19. Antiviral treatments can help reduce the severity of symptoms, shorten the duration of illness, and lower the risk of complications. However, they are most effective when started early in the course of the infection.