中国健康受试者多剂量静脉滴注左氧氟沙星注射液的药物动力学

目的:研究左氧氟沙星注射液多剂量给药在健康人体内的药代动力学.方法:10名健康男性受试者给予左氧氟沙星注射液200mg,注射时间为60min,连续给药7天,其中第1天及第7天给药1次,第2到6天每天给药2次,间隔12h 采用反相高效液相色谱法测定血及尿药浓度.结果:第一次给药的主要药物动力学参数:C_(max)(2.4±0.4)mg/L;AUC_(0-∞)(16.1±1.4)mg·h·L~(-1);T1/3β(6.3±0.3)h.血药浓度于第3天达稳态,稳态后最后一次给药的主要药物动力学参数:C_(ssmax)(2.9±0.4)mg/L;C_(ssmin)(0.71 0.19)mg/L;C_(av)(1.40±0.29)mg/L;AUC_(ss0-12)(17±3)mg·h·L~(-1),T1/2β(6.2±0.8)h.24h内平均尿累积排泄百分率为(88±5)％.累积比为1.20,波动系数为1.30.第一次给药与最后一次给药T1/2β及AUC差异无显著性(P>0.05).整个试验期间,受试者未出现明显的不良反应.结论:左氧氟沙星注射液200mg连续给药7天,药物在体内无明显蓄积.

Pharmacokinetics of multiple intravenous instillation of levofloxacin in Chinese healthy subjects

AIM: To study the pharmacokinetics of multiple doses intravenous infusion of levofloxacin instillation in Chinese healthy volunteers. METHODS: Intravenous infusion of levofloxacin instillation 200 mg within 60 min was given to 10 male healthy volunteers for 7 d, on d 1 and d 7, once-daily, from 2-6 d twice-daily dosing. The concentrations of levofloxacin in serum and urine were assayed by HPLC. RESULTS: The main pharmacokinetic parameters af ter the first dosing were as follows: Cmax was (2.4+/-0.4) mg/L; AUC0- was (16.1 +/- 1.4) mg . h . L-1; T1/2beta was (6.3 +/- 0.3) h. The concentration in serum reached steady state within 72 h. The main parameters after the last dosing were as follows: Cssmax was (2.9 +/- 0.4) mg/L; Cssmin was (0.71 +/- 0.19) mg/L; Cav was (1.40 +/- 0.29) mg/L; AUCss0-12 was (17 +/- 3) mg . h . L-1; T1/2beta was (6.2 +/- 0.8) h. The 24-h cumulative urinary excretion rate was (88 +/- 5) %. From the calculation, the cumulative rate was 1.20; the fluctuation index was 1.30. The difference of T1/2beta and AUC between the first dosing and the last dosing was not significant, and the elimination rate of levofloxacin was not changed after multiple dosing. No clear adverse events were noted during this study. CONCLUSION: There was no accumulation of drug after the repeated intravenous infusion with 200 mg levofloxacin instillation for 7 d.