代谢
替吡拉西尔在首次通过时不会发生大量代谢。它既不被肝脏或肝细胞代谢,也不被细胞色素P450酶代谢。在人类血浆、尿液或粪便中发现的唯一一种替吡拉西尔衍生的代谢物是6-羟甲基尿嘧啶(6-HMU),这并不是替吡拉西尔独有的。这种代谢物被认为是通过肠细菌代谢形成的。在血浆中,这两种代谢物的比例分别为替吡拉西尔53.1%,6-HMU 30.9%。
Tipiracil does not undergo much metabolism upon first pass. It is not metabolized by the liver or hepatocytes, nor by the cytochrome P450 enzymes. The only tipiracil-derived metabolite found in very small quantities in human plasma, urine or faeces is 6-hydroxymethyluracil (6-HMU) which is not unique of tipiracil. This metabolite is though to be formed either by enterobacterial metabolism. In plasma, this two metabolites can be found in a proportion of tipiracil 53.1% and 6-HMU 30.9%.
来源:DrugBank