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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 a prescription antiviral medication that can be used to treat an influenza infection (also known as the flu) in children and adults if their symptoms have started within the last day or two. It can also be used to prevent the flu in children, teens, and adults who have been exposed to the influenza virus.