代谢
Sitagliptin大部分未发生代谢,剂量的79%以未改变的母化合物形式从尿液中排出。次要的代谢途径主要由细胞色素p450(CYP)3A4介导,在较小程度上由CYP2C8介导。18小时后,剂量的81%保持未改变,而2%被N-硫酸化成M1代谢物,6%被氧化脱饱和并环化成M2代谢物,不到1%在未知位点发生葡萄糖苷酸化成M3代谢物,不到1%被尿素化和葡萄糖苷酸化成M4代谢物,6%被氧化饱和并环化成M5代谢物,2%在未知位点发生羟基化成M6代谢物。M2代谢物是顺式异构体,而M5代谢物是同一代谢物的反式异构体。
Sitagliptin is mostly not metabolised, with 79% of the dose excreted in the urine as the unchanged parent compound. Minor metabolic pathways are mediated mainly by cytochrome p450(CYP)3A4 and to a lesser extent by CYP2C8. After 18 hours, 81% of the dose has remained unchanged, while 2% has been N-sulfated to the M1 metabolite, 6% has been oxidatively desaturated and cyclized to the M2 metabolite, <1% glucuronidated at an unknown site to the M3 metabolite, <1% has been carbamoylated and glucuronidated to the M4 metabolite, 6% has been oxidatively saturated and cyclized to the M5 metabolite, and 2% has been hydroxylated at an unknown site to the M6 metabolite. The M2 metabolite is the cis isomer while the M5 metabolite is the trans isomer of the same metabolite.
来源:DrugBank