title: Pharmacokinetics of terfenadine in healthy elderly subjects.
abstract: The pharmacokinetics of the terfenadine active metabolite, metabolite I, was examined in ten healthy elderly adults and ten younger adults after single-dose oral administration of 120-mg terfenadine. All subjects successfully completed the study without reporting sedation or other adverse events. Absorption was rapid in both the young and elderly. The mean Cmax was the same for both groups, 501 ng/mL, and occurred at 2.3 hours in the young subjects and 2.5 hours in elderly subjects. However, the apparent clearance was reduced by about 25% in the elderly. After correcting clearance for bodyweight, this difference was not statistically significant.
authors.affiliation: Drug Metabolism Department, Marion Merrell Dow Inc., Cincinnati, OH 45215-6300.
authors.forename: M G
authors.initials: MG
authors.lastname: Eller
authors.forename: B J
authors.initials: BJ
authors.lastname: Walker
authors.forename: P A
authors.initials: PA
authors.lastname: Westmark
authors.forename: S J
authors.initials: SJ
authors.lastname: Ruberg
authors.forename: K K
authors.initials: KK
authors.lastname: Antony
authors.forename: B E
authors.initials: BE
authors.lastname: McNutt
authors.forename: R A
authors.initials: RA
authors.lastname: Okerholm
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D001835:Body Weight; D006801:Humans; D007408:Intestinal Absorption; D008297:Male; D008657:Metabolic Clearance Rate; D016593:Terfenadine / Q000008:administration & dosage / Q000009:adverse effects / Q000378:metabolism / Q000493:pharmacokinetics*; D013997:Time Factors
chemical_list: D016593:Terfenadine