代谢
主要代谢物如下;在肝脏中发现了4-哌啶基二苯基丙氧乙酸(DM-P-4)、1-甲基-4-哌啶基苯甲酸酯(Dpr-P-4)和1-甲基-4-哌啶基二苯基-(2羧基)乙氧乙酸(ω-COOH-P-4),在肾脏中发现Dpt-p-4、DM-P-4,在肺中发现DM-P-4、DPr-P-4。在同一药代动力学研究中,所有具有药理活性的化合物,如未改变的化合物、1-甲基-4-哌啶基苯甲酸酯N-氧化物(DPr-P-4 (N→O))、Dpt-p-4和1-甲基-4-哌啶基二苯基丙氧乙酸N-氧化物(P-4 (N→O))在尿膀胱中的浓度高于血浆,尿膀胱是P-4的目标器官。普罗匹维林通过肠道和肝脏酶进行代谢。主要的代谢途径涉及_piperidyl-N_的氧化,由_CYP 3A4_和_黄素含单加氧酶(FMO)_1和3介导,并导致第二种主要代谢物M-5的形成,其血浆浓度高于母体物质普罗匹维林。服用普罗匹维林后,尿中已鉴定出四种代谢物;其中三种是具有药理活性的代谢物,可能有助于其治疗效果(M-5、M-6、M-23)。普罗匹维林IR 15 mg的平均绝对生物利用度为40.5%。
The major metabolites were found to be as follows; 4-piperidyl diphenylpropoxyacetate (DM-P-4), 1-methyl-4-piperidyl benzilate (Dpr-P-4) and 1-methyl-4-piperidyl diphenyl-(2 carboxy) ethoxyacetate (ω-COOH-P-4) in the liver, Dpt-p-4, DM-P-4 in the kidney, and DM-P-4, DPr-P-4 in the lung. In the same pharmacokinetic study, All pharmacologically active compounds such as the unchanged compound, 1-methyl-4-piperidyl benzilate N-oxide (DPr-P-4 (N→O)), Dpt-p-4 and 1-methyl-4-piperidyl diphenylpropoxyacetate N-oxide (P-4 (N→O)) were present in the urinary bladder, a target organ for P-4, at higher concentrations than in the plasma. Propiverine is metabolized by both intestinal and hepatic enzymes. The main metabolic pathway involves the oxidation of the _piperidyl-N _and is mediated by _CYP 3A4_ and _flavin-containing monooxygenases (FMO) _1 and 3 and results in the formation of the second main metabolite M-5, the plasma concentration of which is greater in concentration that of the parent substance propiverine. Four metabolites have been identified in the urine following propiverine ingestion; 3 them are pharmacologically active metabolites that may contribute to its therapeutic effect (M-5, M-6, M-23). The mean absolute bioavailability of propiverine IR 15 mg is 40.5%.
来源:DrugBank