title: Pharmacokinetics and bioequivalence of two ibuprofen sustained-release formulations after single and multiple doses in healthy chinese male volunteers.
abstract: OBJECTIVE
  The aim of this study was to compare the bioavailability of 2 ibuprofen sustained-release formulations after single and multiple doses.
  
  
  METHODS
  It was conducted on 19 healthy Chinese male volunteers according to an open, randomized, single-blind, 2-way crossover study. Plasma concentrations were determined by liquid chromatography-mass spectrometry. Pharmacokinetic parameters were calculated using a non-compartment model.
  
  
  RESULTS
  In the single-dose study, the values of Cmax, tmax, t1/2, AUC0-τ, AUC0-∞ for test and reference formulations were 12.59±2.29 and 12.84±2.79 μg/mL, 4.5±1.1 and 4.3±0.7 h, 4.15±1.37 and 4.03±0.86 h, 83.71±21.01 and 86.32±23.42 μg · h/mL, 86.05±21.37 and 88.99±25.33 μg · h/mL, respectively. In the multiple-dose study, the values of Cmax, Cmin, tmax, t1/2, AUCss, DF for test and -reference formulations were 14.46±3.08 and 14.00±2.61 μg/mL, 0.47±0.21 and 0.63±0.45 μg/mL, 4.0±0.9 and 4.3±0.9 h, 4.69±1.61 and 4.99±2.16 h, 89.11±19.04 and 89.23±20.56 μg · h/mL, 3.25±0.50 and 3.06±0.71, respectively. Single-dose relative bioavailability were 97.8±10.5% for AUC0-τ and multiple-dose relative bioavailability were 100.6±9.4% for AUCss. The 90% confidence intervals of the T/R-ratios of logarithmically transformed data were in the generally accepted range of 80-125%.
  
  
  CONCLUSIONS
  This means that the test formulation is bioequivalent to the reference formulation.
authors.affiliation: Key Laboratory of Drug Quality Control and Pharmacovigilance, China Pharmaceutical University, Ministry of Education, Jiangsu, P. R. China.
authors.forename: L-F
authors.initials: LF
authors.lastname: Luo
authors.forename: Y
authors.initials: Y
authors.lastname: Tian
authors.forename: H-M
authors.initials: HM
authors.lastname: Guo
authors.forename: G
authors.initials: G
authors.lastname: Li
authors.forename: Z-J
authors.initials: ZJ
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000493:pharmacokinetics*; D019540:Area Under Curve; D002626:Chemistry, Pharmaceutical; D018592:Cross-Over Studies; D003692:Delayed-Action Preparations; D006801:Humans; D007052:Ibuprofen / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008297:Male; D016037:Single-Blind Method; D013810:Therapeutic Equivalency
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003692:Delayed-Action Preparations; D007052:Ibuprofen