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. 2010 Jun 3;5(6):e10938.
doi: 10.1371/journal.pone.0010938.

Plasma concentrations of oseltamivir and oseltamivir carboxylate in critically ill children on extracorporeal membrane oxygenation support

Enno D Wildschut  1 , Matthijs de Hoog, Maurice J Ahsman, Dick Tibboel, Albert D M E Osterhaus, Pieter L A Fraaij
Affiliations

Plasma concentrations of oseltamivir and oseltamivir carboxylate in critically ill children on extracorporeal membrane oxygenation support

Enno D Wildschut et al. PLoS One. .

Abstract

Introduction: To evaluate the effect of extracorporeal membrane oxygenation (ECMO) support on pharmacokinetics of oseltamivir and oseltamivir carboxylate (OC) in children.

Methodology: Steady state 0-12 hour pharmacokinetic sampling was performed in new influenza A (H1N1) infected children treated with oseltamivir while on ECMO support. Cmax, Cmin and AUC(0-12 h) were calculated. The age-specific oseltamivir dosage was doubled to counter expected decreased plasma drug concentrations due to increased volume of distribution on ECMO support.

Principal findings: Three patients were enrolled aged 15, 6 and 14 years in this pharmacokinetic case series. For two children the OC plasma concentrations were higher than those found in children and adults not on ECMO. These increased plasma concentrations related to the increased oseltamivir dosage and decreased kidney function. In one patient suboptimal plasma concentrations coincided with a decreased gastric motility.

Conclusion: Oseltamivir pharmacokinetics do not appear to be significantly influenced by ECMO support. Caution is required in case of nasogastric administration and decreased gastric motility. Due to the limited number of (paediatric) patients available further multicenter studies are warranted.

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Conflict of interest statement

Competing Interests: Ab Osterhaus is a parttime employee of Viroclinics Biosciences BV and performs contact research for Roche. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Figures

Figure 1
Figure 1. Oseltamivir concentrations in plasma.
Plasma concentrations (µg/l) are depicted for each individual patient in time (h). Individual patients are marked with a colour code and maker: patient 1: 0, black; patient 2 ▵, blue and patient 3: ▿,red.
Figure 2
Figure 2. OC concentrations in plasma.
Plasma concentrations (µg/l) are depicted for each individual patient in time (h). Individual patients are marked with a colour code and maker: patient 1: 0, black; patient 2 ▵, blue and patient 3: ▿,red.
See this image and copyright information in PMC

References

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