title: Relative biologic availability and pharmacokinetics of albuterol preparations in healthy Chinese.
abstract: The authors' goal was to study the biologic availability and pharmacokinetics of two different formulations of controlled-release (CR) tablets of albuterol. A two-way, cross-over biologic availability study was performed with 20 healthy male volunteers to evaluate the relative biologic availability of two CR tablets of albuterol versus two different formulations of immediate-release (IR) albuterol tablets. Albuterol concentrations in plasma were measured using an HPLC procedure. Each patient subject received a 4.8-mg CR tablet every 12 hours for 6 days and a 4.8-mg IR tablet every 8 hours for 6 days. Tests of single doses and steady state were assayed for CR and IR albuterol tablets. The mean Cmax and tmax for two CR tablets given after a single dose were 7.3+/-1.5, 7.9+/-1.4 microg x L(-1) and 4.6+/-0.8, 4.8+/-0.5 hours, respectively. The Cmax and tmax for two IR tablets given after a single dose were 12.5-/+1.3, 15.3 +/-2.3 microg x L(-1) and 1.3+/-0.4, 1.6+/-0.4 hours, respectively. The relative biologic availability of two CR albuterol tablets were 106.0+/-6.2% and 109.8+/-9.0%, respectively. Administration of CR albuterol twice a day provides an alternative to administration of IR albuterol three or four times a day.
authors.affiliation: Department of Centre Instrumental Analysis, Jinling Hospital, Nanjing, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yuan
authors.forename: K
authors.initials: K
authors.lastname: Li
authors.forename: F
authors.initials: F
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000420:Albuterol / Q000008:administration & dosage / Q000493:pharmacokinetics*; D001682:Biological Availability; D002681:China; D002851:Chromatography, High Pressure Liquid; D018592:Cross-Over Studies; D003692:Delayed-Action Preparations / Q000493:pharmacokinetics; D004334:Drug Administration Schedule; D006801:Humans; D008297:Male; D013997:Time Factors
chemical_list: D003692:Delayed-Action Preparations; D000420:Albuterol