The Rule of Unity for Human Intestinal Absorption 2: Application to Pharmaceutical Drugs that are Marketed as Salts

Author(s): Raj B. Patel, Brittany Admire, Samuel H. Yalkowsky

Journal Name: Current Drug Delivery

Volume 12 , Issue 2 , 2015

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Graphical Abstract:


The efficiency of the human intestinal absorption (HIA) of the 59 drugs which are marketed as salts is predicted using the rule of unity. Intrinsic aqueous solubilities and partition coefficients along with the drug dose are used to calculate modified absorption potential (MAP) values. These values are shown to be related to the fraction of the dose that is absorbed upon oral administration in humans (FA). It is shown that the MAP value can distinguish between drugs that are poorly absorbed (FA <0.5) and those that are well absorbed (FA ≥ 0.5). Inspection of the data as well as a receiver operative characteristic (ROC) plot shows that a single critical MAP value can be used for predicting efficient human absorption of drugs. This forms the basis of a simple rule of unity based solely on in vitro data for predicting whether or not a drug will be well absorbed at a given dose.

Keywords: Absorption, oral dose, prediction, permeability, salts, solubility.

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Article Details

Year: 2015
Published on: 22 April, 2015
Page: [238 - 243]
Pages: 6
DOI: 10.2174/1567201811666141022100320
Price: $65

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