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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: Oseltamivir belongs to the family of medications called antivirals. It is used to treat the influenza viruses that cause the flu. It works by inhibiting an enzyme the flu virus needs to spread through your body. If it is used within 2 days of the start of flu symptoms, oseltamivir can reduce the time it takes for flu symptoms to improve by about one day.