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标题：Studies on Interactions between Functional Foods or Dietary Supplements and Medicines. I. Effects of Ginkgo biloba Leaf Extract on the Pharmacokinetics of Diltiazem in Rats
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作者：Noriaki Ohnishi ; Mayako Kusuhara ; Mutsunobu Yoshioka 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2003
卷号：26
期号：9
页码：1315-1320
DOI：10.1248/bpb.26.1315
出版社：The Pharmaceutical Society of Japan
摘要：The effects of Ginkgo biloba leaf extract (GBE), one of the most widely used herbal dietary supplements in Japan, on the pharmacokinetics of diltiazem (DTZ), a typical probe of cytochrome P450 (CYP) 3A, were examined in rats. The simultaneous addition of GBE to small intestine and liver microsomes inhibited the formation of N -demethyl DTZ (MA), an active metabolite of DTZ produced by CYP3A, in a concentration-dependent manner, with an IC₅₀ of about 50 and 182 μg/ml, respectively. This inhibition appeared to be caused, at least in part, by a mechanism-based inhibition. Both the rate of formation of MA and total amount of CYP in intestinal or hepatic microsomes after a single oral pretreatment with GBE (20 mg/kg) decreased transiently. The pretreatment significantly decreased the terminal elimination rate constant and increased the mean residence time, after intravenous administration of DTZ (3 mg/kg). Furthermore, it significantly increased the area under the concentration–time curve and absolute bioavailability after oral administration of DTZ (30 mg/kg). These results indicated that the concomitant use of GBE in rats increased the bioavailability of DTZ by inhibiting both intestinal and hepatic metabolism, at least in part, via a mechanism-based inhibition for CYP3A.
关键词：Ginkgo biloba leaf;diltiazem;pharmacokinetic interaction;P450;metabolism;rat