代谢
左西替利嗪的代谢较差,85.8%的口服剂量以未改变的药物形式被排泄。左西替利嗪可以被代谢为二氢二醇(M2)、N-氧化物(M3)、羟甲氧基衍生物(M4)、羟基衍生物(M5)、O-脱烷基衍生物(M6)、牛磺酸结合物(M8)以及N-脱烷基化和芳香羟基化衍生物(M9)。M5代谢物可以与葡萄糖酸结合形成M1代谢物,而M9代谢物可以形成4-氯-4'-羟基苯甲基巯基尿酸酯(M10a和M10b)。
Levocetirizine is poorly metabolized with 85.8% of an oral dose being excreted as the unchanged drug. Levocetirizine can be metabolized to a dihydrodiol (M2), an N-oxide (M3), a hydroxymethoxy derivative (M4), a hydroxy derivative (M5), an O-dealkylated derivative (M6), a taurine conjugate (M8), and an N-dealkylated and aromatic hydroxylated derivative (M9). The M5 metabolite can be glucuronidated to form the M1 metabolite and the M9 metabolite can form 4-chloro-4'-hydroxybenzhydryl mercapturates (M10a and M10b).
来源:DrugBank