The antiviral drug oseltamivir (Tamiflu) blocks the release of the virus from infected cells and must be given within 24-48 hours of infection to be effective against the duration of the flu symptoms. Based on how the influenzavirus manifests signs and symptoms, why is the 24-48 hour window important?
Tamiflu works best when taken within 48 hours of onset of flu symptoms, but it may still offer benefits when taken later. It reduces the duration of flu by one to two days and prevent severe flu complication
