What is the definition of antiviral agents?

Antiviral agents are medicines that treat viral infections. Antivirals like oseltamivir phosphate (Tamiflu), peramivir (Rapivab), or zanamivir (Relenza) can be used to treat the flu or to help prevent it in people at high risk. As a treatment, they work best if you get them within the first two days after your symptoms start.