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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 (generic name: oseltamivir) is an antiviral medication used to attenuate and shorten the duration of the influenza virus, known also as the flu. In order to be most effective, Tamiflu must be taken within the first two days of the appearance of flu symptoms. It can also be used to prevent the contraction of influenza in high-risk patients who were in contact with an infected person.