1. Population pharmacokinetics and dosing optimization of olanzapine in Chinese paediatric patients: Based on the impact of sex and concomitant valproate on clearance
- Author
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Tao Xiao, Jin‐Qing Hu, Shu‐Jing Liu, Hui‐Qin Lu, Xiao‐Lin Li, Wan Kong, Shan‐Qing Huang, Xiu‐Qing Zhu, Ming Zhang, Hao‐Yang Lu, Xiao‐Jia Ni, Han‐Lun Yang, De‐Wei Shang, and Yu‐Guan Wen
- Subjects
Pharmacology ,Adult ,Male ,China ,Valproic Acid ,Models, Biological ,Kinetics ,Olanzapine ,Humans ,Pharmacology (medical) ,Female ,Child ,Aged ,Antipsychotic Agents - Abstract
Olanzapine is an atypical antipsychotic drug used for mental disorders. There are limited studies providing sufficient pharmacokinetic data, thus the variability of concentrations of olanzapine used in Chinese paediatric patients aged 10 to 17 years remains to be evaluated.Therapeutic drug monitoring data were collected from 151 paediatric patients aged 10 to 17 years who received olanzapine. The model was developed with a NONMEM software program. The final model validation and evaluation were assessed by bootstrap, diagnostic scatter plots, and normalized prediction distribution error (NPDE). Regimens of different dosages were simulated to reach the target concentration levels of 20 ng/ml, by using the final model with typical parameters.The one-compartment model was considered the best fit for the data. Typical estimates of the absorption rate constant (Ka), apparent clearance (CL/F), and apparent distribution volume (V/F) in the final model were 0.142 hOur results identified concomitant valproate and sex as significant covariates in olanzapine population pharmacokinetics. Our model may be a useful tool for recommending dosage adjustments for physicians. The pharmacokinetics of olanzapine in patients aged 10 to 17 years was generally similar to that of adults and the elderly.
- Published
- 2022