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Medication, antiviral: An drug that kills viruses or suppresses their replication and, hence, inhibits their capability to multiply and reproduce.
For example, amantadine (Symmetrel) is a synthetic (man-made) drug that inhibits the multiplication of the influenza A virus and was once used to prevent the flu. Safer medicines such as oseltamivir ( Tamiflu) and zanamivir ( Relenza) can be used to prevent the flu shortly after exposure or to reduce the severity. Flu antiviral drugs work best for treatment when they are started within 2 days of getting sick. However, starting them later can still be helpful, especially if the sick person has a high risk health condition or is very sick from the flu. (Neither drug is a substitute for flu shots).