title: Comparative bioavailability study of two cefixime formulations administered orally in healthy male volunteers.
abstract: The bioavailability of a new cefixime ((6R,7R)-7-[(Z)-2-(2-amino-4-thiazolyl)-2-(carboxymethoxyimino) acetamido]-8-oxo-3-vinyl-5-thia-1-azabicyclo-[4,2,0]-oct-2-ene-2-carboxylic acid, CAS 79350-37-1) tablet preparation (Loprax) was compared with that of a reference preparation of the drug in 24 healthy male volunteers. The trial was designed as an open, randomized, single-blind, two-sequence, two-period crossover study. Under fasting conditions, each subject received a single oral dose of 400 mg cefixime tablet as a test or reference formulation on 2 treatment days. The treatment periods were separated by a one-week washout period. The plasma concentrations of the drug were analyzed by a rapid and sensitive HPLC method with UV detection. The pharmacokinetic parameters included AUC0-24h, AUC0-infinity, Cmax, t1/2, and Ke. The mean AUC0-infinity of cefixime was 45008.7 +/- 10989.9 and 45221.3 +/- 2155.7 n x h/ml for the test and reference formulation, respectively. The maximum plasma concentration (Cmax) of cefixime was on average 4746.9 +/- 1284 ng/ml for the test and 4726.3 +/- 1206.9 ng/ml for the reference product. No statistical differences were observed for Cmax and the area under the plasma concentration-time curve for test and reference tablets. The calculated 90% confidence intervals based on the ANOVA analysis for the mean test/reference ratios of Cmax, AUC0-infinity and AUC0-24h of cefixime were in the bioequivalence range (94%-112%). Therefore, the two formulations were considered to be bioequivalent.
authors.affiliation: School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. Pzakeri@tbzmed.ac.ir
authors.forename: Parvin
authors.initials: P
authors.lastname: Zakeri-Milani
authors.forename: Hadi
authors.initials: H
authors.lastname: Valizadeh
authors.forename: Ziba
authors.initials: Z
authors.lastname: Islambulchilar
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D019540:Area Under Curve; D001682:Biological Availability; D020682:Cefixime / Q000008:administration & dosage / Q000493:pharmacokinetics*; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D018592:Cross-Over Studies; D004311:Double-Blind Method; D016568:Drugs, Generic; D006207:Half-Life; D006801:Humans; D007408:Intestinal Absorption; D008297:Male
chemical_list: D000900:Anti-Bacterial Agents; D016568:Drugs, Generic; D020682:Cefixime