Population pharmacokinetics of a combination of miltefosine and paromomycin in Eastern African children and adults with visceral leishmaniasis

Luka Verrest, Ignace C. Roseboom, Monique Wasunna, Jane Mbui, Simon Njenga, Ahmed M. Musa, Joseph Olobo, Rezika Mohammed, Koert Ritmeijer, Wan Yu Chu, Alwin D.R. Huitema, Alexandra Solomos, Fabiana Alves, Thomas P.C. Dorlo*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Objectives: To improve visceral leishmaniasis (VL) treatment in Eastern Africa, 14-and 28-day combination regimens of paromomycin plus allometrically dosed miltefosine were evaluated. As the majority of patients affected by VL are children, adequate paediatric exposure to miltefosine and paromomycin is key to ensuring good treatment response. Methods: Pharmacokinetic data were collected in a multicentre randomized controlled trial in VL patients from Kenya, Sudan, Ethiopia and Uganda. Patients received paromomycin (20 mg/kg/day for 14 days) plus miltefosine (allometric dose for 14 or 28 days). Population pharmacokinetic models were developed. Adequacy of exposure and target attainment of paromomycin and miltefosine were evaluated in children and adults. Results: Data from 265 patients (59% ≤12 years) were available for this pharmacokinetic analysis. Paromomycin exposure was lower in paediatric patients compared with adults [median (IQR) end-of-Treatment AUC0-24h 187 (162-203) and 242 (217-328) μg·h/mL, respectively], but were both within the IQR of end-of-Treatment exposure in Kenyan and Sudanese adult patients from a previous study. Cumulative miltefosine end-of-Treatment exposure in paediatric patients and adults [AUCD0-28 517 (464-552) and 524 (456-567) μg·day/mL, respectively] and target attainment [time above the in vitro susceptibility value EC90 27 (25-28) and 30 (28-32) days, respectively] were comparable to previously observed values in adults. Conclusions: Paromomycin and miltefosine exposure in this new combination regimen corresponded to the desirable levels of exposure, supporting the implementation of the shortened 14 day combination regimen. Moreover, the lack of a clear exposure-response and exposure-Toxicity relationship indicated adequate exposure within the therapeutic range in the studied population, including paediatric patients.

Original languageEnglish
Pages (from-to)2702-2714
Number of pages13
JournalJournal of Antimicrobial Chemotherapy
Volume78
Issue number11
DOIs
Publication statusPublished - 1 Nov 2023

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