目的:研究大鼠灌胃不同厂家尼群地平片后体内药代动力学的一致性。方法:固体灌胃给予SD雄性大鼠尼群地平50mg/kg,用液质联用的方法测定不同时间的血药浓度,用DAS 3.0数据处理系统对测得的血药浓度数据进行药代动力学参数的计算。结果:三个原料药生产厂家的测定结果显示,晶Ⅳ型尼群地平原料药较常用晶型即晶Ⅰ型有着更好的药物吸收和相对生物利用度,为优势药物晶型;随机抽取的临床常用的16个不同厂家尼群地平产品的大鼠体内药代动力学参数结果呈现差异性,Cmax、tmax、t1/2、AUC(0-t)四个主要参数的最大差异分别可以达到2.5、24.4、4.5和1.6倍之多。结论:不同厂家的尼群地平片在大鼠体内的药代动力学过程存在显著差异,化合物的晶型状态是导致差异的一个重要因素。
AIM: To study the pharmacoki- neties of different nitrendipine tablets in rats. METHODS: An LC-MS method was established for the detection of nitrendipine in plasma after a single oral dose of 50 mg/kg nitrendipine tab- lets. Pharmacokinetics parameters were calculat- ed by DAS 3.0 data-processing .system. RE- SULTS: Determination results of the three bulk drug manufactures indicated that nitrendipine form 1V had a higher absorption and bioavail- ability than nitrendipine form I which was com- monly used. Pharmacokinetic parameters of the 16 products selected randomly from different in- dustries were different after a single dose of 50 mg/kg. Maximum differences of C t h/2 , AUC(0-t) came up to 2.5, 24.4, 4.5 and 1.6 times. CONCLUSION: There are differences a mong the pharmacokinetics of different nitren- dipine tablets in rats. Crystal form is a principal element leading to the discrepancies.