title: Decreased oral bioavailability of loxoprofen at second administration in human subjects.
abstract: The objective of this study was to determine the extent of period effect on the pharmacokineitcs of loxoprofen during consecutive dosing. Loxipen and Loxonin tablets were administered to 16 healthy Korean male subjects at a single dose of 60 mg as loxoprofen sodium anhydrous in a 2 x 2 crossover investigation with a two-week wash-out phase. Concentrations of loxoprofen in plasma were measured by HPLC method for 6 h. The two formulations were found bioequivalent, but analysis of variance (ANOVA) indicated that there was a significant (p < 0.05) period effect in AUCinf (area under the plasma concentration-time curve from time zero to infinity) between the administrations. A 20% decrease in the AUC was seen at the second administration. This period effect on pharmacokinetics of loxoprofen may be relevant for the patients who need consecutive administration of the drug.
authors.affiliation: Department of Pharmaceutics, College of Pharmacy, Seoul National University, Korea.
authors.forename: I W
authors.initials: IW
authors.lastname: Kim
authors.forename: K S
authors.initials: KS
authors.lastname: Choo
authors.forename: T G
authors.initials: TG
authors.lastname: Han
authors.forename: K S
authors.initials: KS
authors.lastname: Kim
authors.forename: S J
authors.initials: SJ
authors.lastname: Chung
authors.forename: M H
authors.initials: MH
authors.lastname: Lee
authors.forename: C K
authors.initials: CK
authors.lastname: Shim
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000704:Analysis of Variance; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000097:blood / Q000493:pharmacokinetics*; D019540:Area Under Curve; D001682:Biological Availability; D006801:Humans; D008297:Male; D010666:Phenylpropionates / Q000097:blood / Q000493:pharmacokinetics*; D013607:Tablets; D013810:Therapeutic Equivalency
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D010666:Phenylpropionates; D013607:Tablets; C040656:loxoprofen