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Journal of Tropical Pediatrics Advance Access published online on August 26, 2005
Journal of Tropical Pediatrics, doi:10.1093/tropej/fmi082
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© The Author [2005]. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Original Papers

Chloramphenicol Pharmacokinetics in African Children with Severe Malaria

Gilbert O. Kokwaro, 1*, Simon N. Muchohi 2, Benhards R. Ogutu 2, and Charles R. J. C. Newton 3

1 Department of Pharmaceutics and Pharmacy Practice, Faculty of Pharmacy, University of Nairobi, Nairobi, Kenya; KEMRI/Wellcome Trust Programme, Nairobi, Kenya
2 KEMRI/Wellcome Trust Programme, Nairobi, Kenya
3 KEMRI/Wellcome Trust Programme, Centre for Geographic Medicine Research, Kilifi, Kenya; Neurosciences Unit, Institute of Child Health, University of London, London, UK

* To whom correspondence should be addressed.
Gilbert O. Kokwaro,, E-mail: Gkokwaro{at}wtnairobi.mimcom.net


  Abstract

The objective of this study was to determine if the current dosage regimen for chloramphenicol (CAP) administered to children with severe malaria (SM) for presumptive treatment of concomitant bacterial meningitis achieves steady state plasma CAP concentrations within the reported therapeutic range of 10-25 mg/l. Fifteen children (11 male, 4 female) with a median age of 45 months (range: 10-108 months) and having SM, were administered multiple intravenous doses (25 mg/kg, 6 hourly for 72 h) of chloramphenicol sodium succinate (CAPS) for presumptive treatment of concomitant bacterial meningitis. Blood samples were collected over 72 h, and plasma CAPS, CAP and CSF CAP concentrations determined by high performance liquid chromatography. Average steady state CAP concentrations were approximately 17 mg/l, while mean fraction unbound (0.49) and CSF/plasma concentration ratio (0.65) were comparable to previously reported values in Caucasian children. Clearance was variable (mean = 4.3 l/h), and trough plasma concentrations during the first dosing interval were approximately 6 mg/l. Simulations indicated that an initial of loading dose of 40 mg/kg CAPS, followed by a maintenance dose of 25 mg/kg every 6 h would result in trough CAP concentrations of approximately 10 mg/l and peak concentrations <25 mg/l throughout the treatment period. The current dosage regimen for CAP needs to include a loading dose of 40 mg/kg CAPS to rapidly achieve plasma CAP concentrations within the reported therapeutic range.


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