头孢拉定在体内和体外对杀灭革兰氏阴性菌通常很有效，但是在给药间隔内，机体的药物浓度如低于最低抑菌浓度（MIC），则不能最有效地杀灭细菌，因此间隔性给药并不总能产生令人满意的疗效，所以2会小时连续给药就显得特别重要。本文研究的目的就是检验这种能提供24小时恒定输 Cephradine is generally effective in killing Gram-negative bacteria both in vitro and in vivo, but the body’s drug concentration, such as below the minimum inhibitory concentration (MIC), can not kill the bacteria most effectively during the dosing interval and thus the interval Sexual administration does not always produce satisfactory results, so it is particularly important that 2 hours of continuous administration. The purpose of this study is to test this can provide a 24-hour constant output