Oseltamivir Treatment for Influenza

Standard Treatment Duration

The American Academy of Family Physicians recommends treating all patients with uncomplicated influenza for exactly 5 days with twice-daily dosing 2, 3, 4, 5
The Centers for Disease Control and Prevention recommends treating adults and adolescents ≥13 years with 75 mg twice daily for 5 days 2, 3, 4, 5

The Infectious Diseases Society of America recommends extending treatment beyond 5 days based on clinical response and evidence of persistent viral replication in critically ill or immunocompromised patients 1, 6
The American Academy of Family Physicians recommends extending treatment for 7-10+ days in immunocompromised patients or those with severe pneumonia requiring ICU admission 1, 6

The Infectious Diseases Society of America recommends not withholding treatment in hospitalized patients simply because >48 hours have elapsed since symptom onset — treatment can still reduce morbidity and mortality even when initiated late 1, 6
The American Academy of Family Physicians recommends not automatically stopping at 5 days in critically ill patients — these populations often have prolonged viral replication requiring extended treatment 1, 6