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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.
It is not known if TAMIFLU is: 1  effective in people who start treatment after 2 days of developing flu symptoms. 2  effective for the treatment of the flu in people with long-time (chronic) heart problems or breathing problems.