title: Pediatric pharmacokinetic data: implications for environmental risk assessment for children.
abstract: Pharmacology and toxicology share a common interest in pharmacokinetic data, especially as it is available in pediatric populations. These data have been critical to the clinical pharmacologist for many years in designing age-specific dosing regimens. Now they are being used increasingly by toxicologists to understand the ontogeny of physiologic parameters that may affect the metabolism and clearance of environmental toxicants. This article reviews a wide range of physiologic and metabolic factors that are present in utero and in early postnatal life and that can affect the internal dose of an absorbed chemical and its metabolites. It also presents a child/adult pharmacokinetic database that includes data for 45 therapeutic drugs organized into specific children's age groupings and clearance pathways. Analysis of these data suggests that substantial child/adult differences in metabolism and clearance are likely for a variety of drugs and environmental chemicals in the early postnatal period. These results are also relevant to in utero exposures, where metabolic systems are even more immature, but exposures are greatly modified by the maternal system and placental metabolism. The implications of these child/adult differences for assessing children's risks from environmental toxicants is discussed with special focus on physiologically based pharmacokinetic modeling strategies that could simulate children's abilities to metabolize and eliminate chemicals at various developmental stages.
authors.affiliation: Connecticut Department of Public Health, Hartford, Connecticut 06134, USA. gary.ginsberg@po.state.ct.us
authors.forename: Gary
authors.initials: G
authors.lastname: Ginsberg
authors.forename: Dale
authors.initials: D
authors.lastname: Hattis
authors.forename: Richard
authors.initials: R
authors.lastname: Miller
authors.forename: Babasaheb
authors.initials: B
authors.lastname: Sonawane
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D016208:Databases, Factual; D064420:Drug-Related Side Effects and Adverse Reactions; D005333:Fetus / Q000378:metabolism; D015386:Hazardous Substances / Q000493:pharmacokinetics; D006801:Humans; D007223:Infant; D007231:Infant, Newborn / Q000378:metabolism; D008657:Metabolic Clearance Rate; D010599:Pharmacokinetics; D018570:Risk Assessment
chemical_list: D015386:Hazardous Substances