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Emerging data on rifampicin pharmacokinetics and approaches to optimal dosing in children with tuberculosis
Kendra K Radtke1, Elin M Svensson2,3, Louvina E van der Laan4
1Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA.
Insights
Rifampicin dosing for pediatric tuberculosis (TB) needs optimization, as current doses show low drug exposure in children. Further research is crucial for effective treatment, especially in vulnerable groups and for shortening treatment durations.
Area of Science:
- Pharmacology
- Pediatric Infectious Diseases
- Tuberculosis Research
Background:
- Rifampicin is a cornerstone in tuberculosis (TB) treatment.
- Emerging research highlights gaps in understanding pediatric TB treatment, particularly rifampicin pharmacokinetics and optimal dosing in children.
Purpose of the Study:
- To review current data on rifampicin use in pediatric drug-susceptible TB.
- To discuss rifampicin's role in special pediatric populations (malnutrition, HIV, TB meningitis) and treatment shortening.
- To identify future research priorities for pediatric TB treatment.
Main Methods:
- Literature review of emerging data on rifampicin in pediatric TB.
- Discussion of pharmacokinetic data and clinical outcomes.
- Identification of research gaps and priorities.
Main Results:
- Consistent findings of low rifampicin exposures in children at standard 10-20 mg/kg doses.
- Generally good clinical outcomes in children, but dose optimization is necessary.
- Need for optimized dosing in high-risk pediatric populations and for treatment shortening.
Conclusions:
- Rifampicin dose optimization is critical for pediatric TB, especially for treatment shortening and high-risk groups.
- Pharmacometric analysis and targeted clinical studies (e.g., TB meningitis, high-dose regimens) are needed.
- Development of child-friendly formulations is important.
Introduction:
Despite its longstanding role in tuberculosis (TB) treatment, there continues to be emerging rifampicin research that has important implications for pediatric TB treatment and outstanding questions about its pharmacokinetics and optimal dose in children.
Areas Covered:
This review aims to summarize and discuss emerging data on the use of rifampicin for: 1) routine treatment of drug-susceptible TB; 2) special subpopulations such as children with malnutrition, HIV, or TB meningitis; 3) treatment shortening. We also highlight the implications of these new data for child-friendly rifampicin formulations and identify future research priorities.
Expert Opinion:
New data consistently show low rifampicin exposures across all pediatric populations with 10-20 mg/kg dosing. Although clinical outcomes in children are generally good, rifampicin dose optimization is needed, especially given a continued push to shorten treatment durations and for specific high-risk populations of children who have worse outcomes. A pooled analysis of existing data using applied pharmacometrics would answer many of the important questions remaining about rifampicin pharmacokinetics needed to optimize doses, especially in special populations. Targeted clinical studies in children with TB meningitis and treatment shortening with high-dose rifampicin are also priorities.
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