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Tamiflu is an NA inhibitor. By blocking the NA enzyme the drug makes it harder for the influenza virus to escape a host cell and replicate. As good as this sounds, you have to take the drug within the first day or two of symptoms.
The drug may also help prevent the spread of flu to others. Tamiflu is licensed to treat the flu in adults and children as young as two weeks of age. Prevention of Influenza. Tamiflu is also used to decrease the chances of developing symptoms of the flu in the first place.It can be used for flu prevention in adults, as well as in children 1 year of age and older.reatment of Influenza. Tamiflu is effective against the two most common influenza viruses -- Influenza A and Influenza B. The 2009 H1N1 strain is an Influenza A virus, and Tamiflu is expected to be effective against H1N1 influenza.