A Study of Intravenous Tamiflu (Oseltamivir) in Children With Influenza

An Open Label, Prospective, Pharmacokinetic/Pharmacodynamic and Safety Evaluation of Intravenous Oseltamivir (Tamiflu) in the Treatment of Children 1 to 12 Years of Age With Influenza Infection

This open-label study will assess the pharmacokinetics/pharmacodynamics and safety of intravenous (iv) Tamiflu (oseltamivir) in 3 cohorts of children, aged 6-12, 3-5 and 1-2 years, with influenza infection. Patients will receive iv Tamiflu therapy for 5 days (10 doses). For patients whose conditions no longer merit continued iv dosing, therapy may be switched to oral Tamiflu to complete their prescribed course of treatment. If medically necessary, iv or oral therapy with Tamiflu may be continued for up to 5 additional days. Anticipated time on study treatment is 5 to 10 days.

5-day course (10 doses), intravenous administration, may be switched to oral administration at the discretion of the investigator; up to 5 additional days of treatment possible.

Area Under the Concentration Versus Time Curve From Time Zero to Last Measurable Plasma Concentration (AUClast) of Oseltamivir and Oseltamivir Carboxylate on Day 1

Day 3 (with or after fifth dose): 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 3 (with or after fifth dose): 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Day 1: 15 minutes pre-infusion start, 1, 2, 3, 4, 6, 8, 12 hours post start of infusion; Day 2, 3 (with or after fifth dose), 4 or 5: 15 minutes pre-infusion start, 2, 4, 8 hours after start of infusion

Participants With Greater Than or Equal to (>=) 5-Fold Change in Neuraminidase Inhibition (NAI) Assay 50 Percent (%) Inhibitory Concentration (IC50) Values

IC50 was defined as the concentration that causes 50% inhibition of viral activity. IC50 values were calculated using NAI assay. The 5-fold change was calculated as either >=5 times change in the NAI IC50 visit value from the Reference value at a visit, >=5 times change in the NAI IC50 Visit value from the Baseline value.

Inclusion Criteria: children, 1-12 years of age diagnosis of influenza duration of influenza symptoms </=96 hours prior to first dose of study drug Exclusion Criteria: evidence of severe hepatic decompensation patients taking probenecid within 1 week prior to first dose of study drug

Munoz FM, Anderson EJ, Deville JG, Clinch B, Kamal MA. Pharmacokinetics and safety of intravenous oseltamivir in infants and children in open-label studies. Int J Clin Pharmacol Ther. 2015 Jul;53(7):531-40. doi: 10.5414/CP202307.