The 24–48-hour window is important because if you attempt to take Tamiflu after that 48-hour timeframe, the drug might not be effective. "The drug will be of little value if started after 48 hours for normal, healthy people and children with normal immune systems.
What does Tamiflu actually do?
The antiviral medication Tamiflu (oseltamivir phosphate). It functions by fighting the influenza virus to prevent it from proliferating in your body and by lessening flu symptoms. If you take Tamiflu before being sick, it may occasionally prevent you from getting the flu. Tamiflu doesn't heal the flu completely or instantly. But it decreases the severity of your flu symptoms and can shorten your illness by 1 to 2 days.
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