Population Pharmacokinetics of Levocetirizine in Children with Uncontrolled Allergic Asthma: An Ongoing Study
Abstract
Objectives: This study is part of an ongoing effort to improve precision therapy in pediatric asthma by integrating pharmacokinetics (PK) with biomarker-based pharmacodynamics. Levocetirizine (LTZ), a selective H1-antihistamine, is being evaluated for its ability to improve asthma control when added to guideline-based therapy in children with uncontrolled persistent allergic asthma. The study employs Histamine Iontophoresis with Laser Doppler (HILD) as a novel, non-invasive pharmacodynamic biomarker to classify participants into hyper- and hypo-responsive phenotypes based on their histamine response. The objective of this study is to develop a population pharmacokinetic (PopPK) model of LTZ in this population and quantify inter-individual variability in exposure. This model will support exposure–response analyses to determine whether HILD phenotype predicts clinical benefit from LTZ, enabling more targeted use of antihistamines in pediatric asthma. Methods: As part of a randomized, double-blind, placebo-controlled 2×2 crossover trial, children aged 7–17 years received 5 mg (if 40kg) oral doses of LTZ. At steady state, intensive PK sampling was performed up to 24 hours. PopPK modeling was conducted in Monolix (2024R1) using data from the first 18 participants. Covariate effects of log-transformed body weight were incorporated on clearance (CL) and central volume of distribution (V1) using fixed allometric functions (0.75 and 1.0, respectively). Other covariates were…
How strong is the evidence?
Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 18 participants or records.
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