Antiviral drugs are prescription medicines (pills, liquid or an inhaled powder) that fight against the flu by keeping flu viruses from reproducing in your body. If you get sick, antiviral drugs can make your illness milder and make you feel better faster. They may also prevent serious flu complications. This fall, antivirals may be prioritized for persons with severe illness or those at higher risk for flu complications.

Source: CDC H1N1 Flu | H1N1 Flu and You