Determination of levofloxacin concentration in plasma of Chinese healthy volun-teers by HPLC with fluorescence detection and bioequivalence study of levofloxa-cin hydrochloride tablets / 药学实践杂志

ABSTRACT

Objective To develop a HPLC-fluorescence method to determine levofloxacin concentration in plasma for studying bioequivalence of levofloxacin hydrochloride tablet in Chinese healthy volunteers .Methods A single-dose of 0 .2 g test or reference preparation was given to 24 healthy volunteers in a randomized crossover study .The concentrations of levofloxacin at different time points were determined by HPLC with fluorescence detection .The pharmacokinetic parameters were calculated using DAS 2 .0 software program .Results The main pharmacokinetic parameters of the test and reference preparation ,t 1/2 、tmax 、ρmax 、AUC0-36 and AUC0-inf ,were respectively (6 .71 ± 0 .95) h and (6 .60 ± 1 .00) h ,(0 .85 ± 0 .30) h and (0 .79 ± 0 .28) h , (2 815 .48 ± 513 .04 ) ng/ml and (3 185 .59 ± 674 .29 ) ng/ml ,(17 157 .61 ± 1 949 .07 ) ng · h/ml and (17 425 .06 ± 2 447 .80) ng · h/ml ,(18 324 .52 ± 2 019 .41) ng · h/ml and (18 540 .41 ± 2 523 .08) ng · h/ml .The statistical analysis showed that the main pharmacokinetic parameters between test and reference preparations were no significant differences .The 90% confidence interval of test and reference preparations AUC 0-36 、AUC0-inf and ρmax were 95 .2% ~102 .5% 、96 .1% ~102 .2%and 82 .8% ~94.9% .Conclusion The test and reference preparations were bioequivalent .