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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 best-known of the prescription flu antiviralsâdrugs that can ease symptoms and shorten the course of the illness by inhibiting the growth of the flu virus in the body.