Oseltamivir is also effective if taken more than 48 hours after the onset of influenza.
It is generally recommended that patients with influenza take oseltamivir within 48 hours of the first onset of symptoms, preferably within 36 hours of oral intake, so that the effect is optimal, but if more than 48 hours of oral oseltamivir still has a certain effect, but the effect will be deviated a little.
The active metabolite of oseltamivir inhibits the infection and replication of the influenza virus, and also reduces the spread of influenza A or B viruses by inhibiting the release of the virus from infected cells. These effects are more pronounced if oseltamivir is taken earlier and less pronounced the later it is taken.
When flu-like symptoms occur during the season of flu transmission, you should visit an infectious disease department as soon as possible to improve the throat swab test and other definitions, and use oseltamivir as soon as possible, so that the flu will usually be controlled more quickly, and the specific medication should be used under the guidance of a doctor.