奥美沙坦酯片在中国健康人体空腹状态的生物等效性研究

目的:研究国产奥美沙坦酯片与原研奥美沙坦酯片（商品名：Benicar）在中国健康人体内空腹状态的生物等效性。方法:采用随机开放双交叉试验设计,24名健康志愿者在空腹状态下单剂量口服国产奥美沙坦酯片（受试制剂）和原研奥美沙坦酯片（参比制剂）20 mg,以液相色谱-串联质谱（LC-MS/MS）法测定血浆中奥美沙坦的浓度。采用WinNonlin7.0软件计算药动学参数,并评价其生物等效性。结果:受试制剂与参比制剂的Cmax分别为（702.08±149.24）和（706.50±127.00）μg/L;tmax分别为1.98（1.33-4.00）和1.98（1.33-3.50）h;AUC0-t分别为（4 516.93±995.07）和（4 543.74±818.45）μg·h·L-1;AUC0-∞分别为（4 578.16±1 005.73）和（4 605.70±820.54）μg·h·L-1;t1/2分别为（8.00±1.07）和（7.94±1.30）h。受试制剂/参比制剂Cmax、AUC0-t、AUC0-∞几何均数的比值分别为98.60%、98.33%和98.30%,其90% CI分别为92.33%～105.29%,91.86%～105.26%,91.89%～105.16%,均落在80.00%～125.00%之间。结论:本研究建立的LC-MS/MS法准确快速,灵敏度高,专属性强,适用于临床试验中奥美沙坦血药浓度测定;国产奥美沙坦片与原研奥美沙坦片具有生物等效性。

Bioequivalence of olmesartan medoxomil tablets in Chinese healthy subjects in fasting state

AIM: To investigate the bioequivalence of domestic olmesartan medoxomil tablets and imported olmesartan medoxomil tablets (Benicar) in Chinese healthy subjects in fasting state. METHODS: This is an open, random and two-way crossover clinical trial involved 24 healthy subjects. A single oral dose 20 mg of domestic olmesartan medoxomil tablets (test preparation) and imported olmesartan medoxomil tablets (control preparation) was administrated under the condition of fasting. The plasma concentrations of olmesartan were determined by LC-MS/MS. The pharmacokinetics parameters were calculated and the bioequivalence of two formulations were evaluated by WinNonlin7.0 program. RESULTS:The main pharmacokinetic parameters of the test and control preparation were as follows: Cmax (702.08±149.24) vs.(706.50±127.00) μg/L; tmax 1.98 (1.33-4.00) vs. 1.98 (1.33-3.50) h; AUC0-t (4 516.93±995.07) vs. (4 543.74±818.45) μg·h·L-1; AUC0-∞ (4 578.16±1 005.73) vs. (4 605.70±820.54) μg·h·L-1;t1/2 (8.00±1.07) vs. (7.94±1.30) h, respectively. The 90% confidence limit of test preparation of the logarithmic transformed parameters Cmax, AUC0-t and AUC0-∞ were in 92.33%-105.29%, 91.86%-105.26%, 91.89%-105.16% vs. the reference preparation, respectively.CONCLUSION: The developed and validated method is rapid, sensitive, selective and reliable for the determination of olmesartan in human plasma; the domestic olmesartan medoxomil tablets are bioequivalence to the imported olmesartan medoxomil tablets.