Residents of long-term care facilities during outbreaks
People with asthma, diabetes, heart disease, or weakened immune systems
Anyone seeking to prevent flu after known exposure
More Information
How quickly does Oseltamivir work against the flu?
When started within 48 hours of symptoms, Oseltamivir begins working immediately to stop viral replication. Most patients feel better 1-2 days sooner than without treatment. Early treatment is crucial - effectiveness drops significantly after 48 hours.
Can Oseltamivir replace the flu vaccine?
No, Oseltamivir is not a substitute for annual flu vaccination. The flu vaccine remains the best prevention method. Oseltamivir is used for treatment when you get the flu or for short-term prevention after exposure, while vaccines provide season-long protection.
Is Oseltamivir effective against all types of flu?
Oseltamivir works against influenza A and B viruses, which cause seasonal flu. It does not work against other viruses like the common cold, COVID-19, or stomach flu (gastroenteritis). A healthcare provider can test to confirm influenza infection.
What if I miss a dose?
Take the missed dose as soon as you remember, unless it's almost time for your next dose. Never double up doses. For treatment, maintain twice-daily schedule; for prevention, return to once-daily dosing. Contact your doctor if you miss multiple doses.
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