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The flu can not be prevented after exposure, only treated using this medicine. Tamiflu works by stopping the flu virus from reproducing within the body. It can help to determine if your child's symptoms are caused by the flu, start taking it as soon as possible after you have been exposed to the influenza virus. Tamiflu should be started as soon as possible from when you begin noticing flu symptoms. Tamiflu can be used to prevent flu symptoms in patients who are likely to come in contact with the influenza virus. Tamiflu reduces the duration of influenza symptoms by one and a half days if treatment is started within forty-eight hours after symptoms occur. Tamiflu works by stopping the flu virus from reproducing within the body.