Population Pharmacokinetics of Oral Baclofen in Pediatric Patients with Cerebral Palsy

To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use. Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day t...

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Published inThe Journal of pediatrics Vol. 164; no. 5; pp. 1181 - 1188.e8
Main Authors He, Yang, Brunstrom-Hernandez, Janice E., Thio, Liu Lin, Lackey, Shellie, Gaebler-Spira, Deborah, Kuroda, Maxine M., Stashinko, Elaine, Hoon, Alexander H., Vargus-Adams, Jilda, Stevenson, Richard D., Lowenhaupt, Stephanie, McLaughlin, John F., Christensen, Ana, Dosa, Nienke P., Butler, Maureen, Schwabe, Aloysia, Lopez, Christina, Roge, Desiree, Kennedy, Diane, Tilton, Ann, Krach, Linda E., Lewandowski, Andrew, Dai, Hongying, Gaedigk, Andrea, Leeder, J. Steven, Jusko, William J.
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.05.2014
Subjects
Online AccessGet full text
ISSN0022-3476
1097-6833
1097-6833
DOI10.1016/j.jpeds.2014.01.029

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Abstract To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use. Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland). R- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss/F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children. The PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.
AbstractList To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use.OBJECTIVETo characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use.Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland).SUBJECTS DESIGNChildren (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland).R- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss/F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children.RESULTSR- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss/F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children.The PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.CONCLUSIONThe PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.
To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use. Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland). R- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss/F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children. The PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.
To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use. Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland). R- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss/F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children. The PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.
Objective To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in order to support its clinical use. Subjects design Children (2-17 years of age) with CP received a dose of titrated oral baclofen from 2.5 mg 3 times a day to a maximum tolerated dose of up to 20 mg 4 times a day. PK sampling followed titration of 10-12 weeks. Serial R- and S-baclofen plasma concentrations were measured for up to 16 hours in 49 subjects. Population PK modeling was performed using NONMEM 7.1 (ICON PLC; Ellicott City, Maryland). Results R- and S-baclofen showed identical concentration-time profiles. Both baclofen enantiomers exhibited linear and dose/kg-proportional PK, and no sex differences were observed. Average baclofen terminal half-life was 4.5 hours. A 2-compartment PK model with linear elimination and transit absorption steps adequately described concentration-time profiles of both baclofen enantiomers. The mean population estimate of apparent clearance/F was 0.273 L/h/kg with 33.4% inter-individual variability (IIV), and the apparent volume of distribution (Vss /F) was 1.16 L/kg with 43.9% IIV. Delayed absorption was expressed by a mean transit time of 0.389 hours with 83.7% IIV. Body weight, a possible genetic factor, and age were determinants of apparent clearance in these children. Conclusion The PK of oral baclofen exhibited dose-proportionality and were adequately described by a 2-compartment model. Our population PK findings suggest that baclofen dosage can be based on body weight (2 mg/kg per day) and the current baclofen dose escalation strategy is appropriate in the treatment of children with CP older than 2 years of age.
Author Roge, Desiree
Tilton, Ann
Kuroda, Maxine M.
Dai, Hongying
Jusko, William J.
Butler, Maureen
Brunstrom-Hernandez, Janice E.
Kennedy, Diane
Gaebler-Spira, Deborah
He, Yang
Lewandowski, Andrew
Christensen, Ana
Thio, Liu Lin
Schwabe, Aloysia
Krach, Linda E.
Vargus-Adams, Jilda
Leeder, J. Steven
Gaedigk, Andrea
Stevenson, Richard D.
Lackey, Shellie
Lowenhaupt, Stephanie
McLaughlin, John F.
Lopez, Christina
Hoon, Alexander H.
Stashinko, Elaine
Dosa, Nienke P.
AuthorAffiliation 11 Center for Development, Behavior, and Genetics
12 Department of Pediatrics, SUNY Upstate Medical University, Syracuse, NY
8 Department of Pediatrics-Developmental Pediatrics
2 Pediatric Neurology Cerebral Palsy Center and Departments of Neurology and Pediatrics, Washington University School of Medicine and St. Louis Children's Hospital
4 Rehabilitation Institute of Chicago
16 Department of Neurology and Pediatrics, Louisiana State University Health Sciences Center, New Orleans, LA
18 The EMMES Corporation, Rockville, MD
15 Department of Rehabilitation Medicine, Children's Mercy Hospital, Kansas City, MO
19 Department of Medical Research
9 Department of Neurology, University of Virginia School of Medicine, Charlottesville, VA
1 Department of Pharmaceutical Sciences, University at Buffalo SUNY, Buffalo, NY
6 Department of Neurology and Developmental Medicine, Kennedy Krieger Institute and Johns Hopkins University, Baltimore, MD
3 Department of Urology, St. Louis Children's Hospital, St. Louis, MO
AuthorAffiliation_xml – name: 7 Division of Pediatric Rehabilitation, Cincinnati Children's Hospital Medical Center, and Center for Epidemiology and Biostatistics, University of Cincinnati College of Medicine, Cincinnati, OH
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ContentType Journal Article
Copyright 2014 Elsevier Inc.
Elsevier Inc.
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1097-6833
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Mon Jul 21 05:53:14 EDT 2025
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Sun Feb 23 10:19:42 EST 2025
Tue Aug 26 17:00:49 EDT 2025
IsDoiOpenAccess false
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Issue 5
Keywords CLCR
CL
AUCτ
MTT
CP
NCA
QID
TID
BS
GERD
SVPC
WTKG
TDOS
SNP
IIV
PG
PopPK
GAGE
PK
Cerebral palsy
Population pharmacokinetics
Noncompartmental analysis
Creatinine clearance
Single-nucleotide polymorphism
Clearance
Standardized visual predictive check
Gestational age
Mean transit time
CL CR
Bootstrap
Pharmacogenomics
Body weight in kg
3 times a day
4 times a day
Total daily dose
Gastroesophageal reflux disease
Inter-individual variability
Area under the curve within the dosing interval
Pharmacokinetics
Language English
License https://www.elsevier.com/tdm/userlicense/1.0
Copyright © 2014 Elsevier Inc. All rights reserved.
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Snippet To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral palsy (CP) in...
Objective To characterize the population pharmacokinetics (PK) of oral baclofen and assess impact of patient-specific covariates in children with cerebral...
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SubjectTerms Absorption
Administration, Oral
Adolescent
Baclofen - blood
Baclofen - pharmacokinetics
Baclofen - therapeutic use
Body Weight
Cerebral Palsy - blood
Cerebral Palsy - drug therapy
Child
Child, Preschool
Dose-Response Relationship, Drug
Drug Administration Schedule
Female
Half-Life
Humans
Male
Metabolic Clearance Rate
Models, Statistical
Multivariate Analysis
Muscle Relaxants, Central - blood
Muscle Relaxants, Central - pharmacokinetics
Muscle Relaxants, Central - therapeutic use
Pediatrics
Title Population Pharmacokinetics of Oral Baclofen in Pediatric Patients with Cerebral Palsy
URI https://www.clinicalkey.com/#!/content/1-s2.0-S0022347614000572
https://www.clinicalkey.es/playcontent/1-s2.0-S0022347614000572
https://dx.doi.org/10.1016/j.jpeds.2014.01.029
https://www.ncbi.nlm.nih.gov/pubmed/24607242
https://www.proquest.com/docview/1517879648
https://pubmed.ncbi.nlm.nih.gov/PMC3992203
Volume 164
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