Abstract：
PURPOSE:The purpose of this human intestinal perfusion study was to investigate the transport and metabolism of R/S-verapamil in the human jejunum (in vivo). METHODS:A regional single-pass perfusion of the jejunum was performed using a Loc-I-Gut perfusion tube in 12 healthy volunteers. Each perfusion lasted for 200 min and was divided into two periods each of 100 min. The inlet concentrations of verapamil were 4.0 and 40 mg/l in period one and two, respectively. RESULTS:The effective jejunal permeability (Peff) of both R- and S-verapamil increased (p < 0.05) when the inlet concentration was increased consistent with saturation of an efflux mechanism. However, both R- and S-verapamil had high intestinal Peff, consistent with complete absorption. The Peff of antipyrine also increased, but there was no difference in the Peff for D-glucose in the two periods. The appearance of R/S-norverapamil in the intestinal perfusate leaving the jejunal segment was non-linear, presumably due to saturation of the CYP3A4 metabolism. CONCLUSIONS:The increased Peff in parallel with increased entering drug concentration is most likely due to saturable efflux by P-glycoprotein(s) in the human intestine.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Sandström R,Karlsson A,Knutson L,Lennernäs Hdoi
10.1023/a:1011916329863subject
Has Abstractpub_date
1998-06-01 00:00:00pages
856-62issue
6eissn
0724-8741issn
1573-904Xjournal_volume
15pub_type
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journal_title：Pharmaceutical research
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journal_title：Pharmaceutical research
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更新日期：2000-05-01 00:00:00
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journal_title：Pharmaceutical research
pub_type： 杂志文章
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更新日期：2012-08-01 00:00:00
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