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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.
Tamiflu is the brand name of the prescription drug oseltamivir, used to treat influenza A and B in people who have flu symptoms. They may also prescribe it to prevent flu in those who have been exposed to it but don't yet have symptoms.