Oseltamivir Treatment Guidelines for Influenza A

Introduction to Oseltamivir Dosage

• The American Academy of Pediatrics recommends oseltamivir (Tamiflu) be administered at 75 mg twice daily for 5 days in adults for the treatment of influenza A, with weight-based dosing for children, starting within 48 hours of symptom onset for maximum efficacy 1

Adult and Pediatric Dosing

• For adults and adolescents ≥13 years, the recommended dosage is 75 mg twice daily for 5 days 1
• For children ≥12 months, weight-based dosing is as follows:
• For infants:

Special Populations

• For preterm infants (based on postmenstrual age):
• For extremely preterm infants (<28 weeks), consultation with a pediatric infectious diseases physician is recommended 1, 2

Renal Dosage Adjustments

• For patients with creatinine clearance 10-30 mL/min, the recommended dosage is 75 mg once daily for 5 days 1

Administration and Prophylaxis

• Oseltamivir can be taken with or without food, though administration with food may improve gastrointestinal tolerability 1
• Available as capsules (30 mg, 45 mg, and 75 mg) and as powder for oral suspension (6 mg/mL) 1
• For children, weight-based dosing is preferred over age-based dosing when weight is known 1, 3
• Oseltamivir remains effective against most circulating influenza strains, including influenza A (H1N1) and A (H3N2) 3, 4