Determination of Bioavailability and Systemically Available Fractions of Drugs Undergoing Reversible Metabolism: Application to 4-Amino-5-chloro-2-[2- (methylsulfinyl)ethoxy]-/V-[2-(diethylamino)ethyl]benzamide and Its Sulfide and Sulfone Metabolites in Rats
作者:Be-Sheng Kuo、James C. Poole、Kin-Kai Hwang、Haiyung Cheng
DOI:10.1002/jps.2600830324
日期:1994.3
mumol/kg) of ML-1035 were bioavailable as ML-1035 and its sulfide metabolite, respectively, while 23 and 65% of a molar equivalent dose of the sulfide metabolite were bioavailable as either compound, respectively. Thus, the sulfide metabolite is better absorbed than ML-1035 in rats. Following oral administration of either ML-1035 or 2, the systemically available fractions of both compounds were weakly
讨论了允许计算生物利用度(F)和进入药物及其相互转换代谢产物的中央循环(f)的口服剂量的比例的方法。还推导并描述了F与f之间以及F与可逆代谢提供的系统可用馏分之间的相互关系。这些原理的应用通过对4-氨基-5-氯-2- [2-(甲基亚磺酰基)乙氧基] -N- [2-(二乙基氨基)乙基]苯甲酰胺(ML-1035,1)和它在大鼠中的硫化物(2)和砜(3)代谢产物。与静脉注射ML-1035一样,口服的ML-1035在该物种中也经历了2种代谢互变,但3种却没有。ML-1035和2均被迅速吸收并且具有药理活性。平均口服剂量的8.3%和13%(152。ML-1035及其硫化物代谢物分别可生物利用4 mol / kg)的ML-1035,而任一化合物分别可生物利用23摩尔当量剂量和65%摩尔当量的硫化物代谢物。因此,在大鼠中,硫化物代谢物比ML-1035更好地被吸收。口服ML-1035或2后,两种化合物的体