A stable-label i.v./oral study design was conducted to investigate the pharmacokinetics (PK) of odanacatib. Healthy, postmenopausal women received oral doses of unlabeled odanacatib administered simultaneously with a reference of 1 mg i.v. stable 13C-labeled odanacatib. The absolute bioavailability of odanacatib was 30% at 50 mg (the phase 3 dose) and 70% at 10 mg, which is consistent with solubility-limited absorption. Odanacatib exposure (area under the curve from zero to infinity) increased by 15% and 63% when 50 mg was administered with low-fat and high-fat meals, respectively. This magnitude of the food effect is unlikely to be clinically important. The volume of distribution was ∼100 liters. The clearance was ∼0.8 l/h (13 ml/min), supporting that odanacatib is a low–extraction ratio drug. Population PK modeling indicated that 88% of individuals had completed absorption of >80% bioavailable drug within 24 hours, with modest additional absorption after 24 hours and periodic fluctuations in plasma concentrations contributing to late values for time to C max in some subjects.
本研究采用稳定标签静脉注射/口服研究设计,以探讨奥达那替的药代动力学(PK)。健康的绝经后妇女在口服未标记的奥达那替布的同时,还静脉注射了1毫克稳定的13C标记的奥达那替布。奥达那替布的绝对
生物利用度为50毫克(第三阶段剂量)30%,10毫克70%,这与溶解度受限的吸收一致。在低脂和高脂膳食中服用50毫克奥达那替时,奥达那替的暴露量(从零到无穷大的曲线下面积)分别增加了15%和63%。这种食物效应的程度不太可能对临床产生重要影响。分布容积为 100 升。清除率为0.8升/小时(13毫升/分钟),证明奥达卡替是一种低萃取率药物。人群 PK 模型显示,88% 的受试者在 24 小时内吸收了大于 80% 的
生物可利用药物,24 小时后的吸收率略有增加,血浆浓度的周期性波动导致一些受试者的最大 C 值时间较晚。