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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 can reduce the length of time you are ill with flu by up to one day, and can reduce the chances of you catching flu from an infected individual by 50%. Tamiflu is particularly recommended if you have a weakened immune system, heart disease or lung disease.