The bioequivalence of cefaclor granules in healthy male volunteers was evaluated.In a randomized crossover study, 20 healthy male volunteers were given a single oral dose of cefaclor.The serum concentrations of cefaclor before and after administration at different time points were determined by HPLC.The pharmacokinetic parameters were calculated and a statistical anal. using DAS 2.0 software program.The main pharmacokinetic parameters of reference and test preparation tmax, Cmax, AUC0→5 and AUC0→∞ were (0.68±0.12) h and (0.68±0.12) h, (12.21±2.80) μg · ml-1 and (11.70±2.65) μg · ml-1, (14.33±3.12) μg · ml-1 · h and (13.65±2.72) μg · ml-1 · h, (14.58±3.20) μg · ml-1 · h and (13.88±2.79) μg · ml-1 · h.The statistical anal. showed that the main pharmacokinetic parameters between test and reference preparations were no significant differences.The 90% confidence interval of tested preparations Cmax, AUC0→5 and AUC0→∞ were 88.3%-104.3%, 88.1%-104.6% and 90.1%-102.4%.The test and reference preparations were bioequivalent.