Procainamide and quinidine inhibition of the degradation of meperidine in human liver was investigated by incubation of two concentrations of either drug with meperidine in homogenates of human liver over 24 and 36 h. Meperidine concentrations declined by 26% after incubation for 24 h and by 42% after incubation for 36 h. In the presence of procainamide, however, they decreased by only 15% to 18% at 24 h and by only 26% to 28% at 36 h. In the presence of quinidine, they declined by only 18% to 19% at 24 h and by only 27% to 28% at 36 h. Procainamide and quinidine may inhibit human hepatic carboxylesterase hCE-1, which is responsible for catalyzing the hydrolysis of meperidine. This inhibition may prolong the biological half-life of meperidine in patients receiving the drug together with either procainamide or quinidine.
研究了
普鲁卡因酰胺和
奎尼丁对人肝脏中美托啡啡降解的抑制作用,方法是将两种药物的两个浓度与美托啡啡在人体肝脏匀浆中孵育24小时和36小时。美托啡啡的浓度在24小时后下降了26%,在36小时后下降了42%。然而,在
普鲁卡因酰胺存在下,24小时内仅下降了15%到18%,36小时内仅下降了26%到28%。在
奎尼丁的存在下,24小时内仅下降了18%到19%,36小时内仅下降了27%到28%。
普鲁卡因酰胺和
奎尼丁可能抑制人类肝脏
羧酸酯酶hCE-1,该酶负责催化美托啡啡的
水解。这种抑制作用可能会延长同时服用
普鲁卡因酰胺或
奎尼丁的患者体内美托啡啡的
生物半衰期。