Gastrointestinal Transit and Drug Absorption

概要

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The gastrointestinal(GI)absorption of orally administered drugs is determined by not only the permeability of GI mucosa but also the transit rate in the GI tract. It is well known that the gastric emptying rate is an important factor affecting the plasma concentration profile or orally administered drugs, and the intestinal transit rate also has a significant influence on the drug absorption, since it determines the residence time of the drug in the absorption site. The reason why the residence time is also a critical factor for drug absorption is that there is the site difference in absorbability for some drugs. We have developed the GI-Transit-Absorption Model(GTIA Model)to analyze and predict the drug absorption kinetics by taking into account both the two factors, i.e. GI transit and drug absorbability including its site difference. GITA Model has been already evidenced to be very useful for estimating the absorption kincties of drugs with various characteristics and applied to assess the human data in Combination with the gamma scintigraphy. In this review, the importance of GI transit rate in determining the absorption kinetics and the bioavailability of orally administered drugs is discusscd mainly employing GITA Model and the results obtained by the model.
公益社団法人日本薬学会の論文
2002-02-01