The fraction dose absorbed, in humans, and high jejunal human permeability relationship

Arik Dahan, Hans Lennernäs, Gordon L. Amidon

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    62 Scopus citations


    The drug intestinal permeability (Peff) measure has been widely used as one of the main factors governing both the rate and/or extent of drug absorption (Fabs) in humans following oral administration. In this communication we emphasize the complexity behind and the care that must be taken with this in vivo Peff measurement. Intestinal permeability, considering the whole of the human intestine, is more complex than generally recognized, and this can lead to misjudgment regarding Fabs and Peff in various settings, e.g. drug discovery, formulation design, drug development and regulation. Setting the adequate standard for the low/high permeability class boundary, the different experimental methods for the permeability measurement, and segmental-dependent permeability throughout the human intestine due to different mechanisms are some of the main points that are discussed. Overall, the use of jejunal Peff as a surrogate for extent of absorption is sound and scientifically justified; a compound with high jejunal Peff will have high Fabs, eliminating the risk for misclassification as a BCS class I drug. Much more care should be taken, however, when jejunal Peff does not support a high-permeability classification; a thorough examination may reveal high-permeability after all, attributable to e.g. segmental-dependent permeability due to degree of ionization or transporter expression. In this situation, the use of multiple permeability experimental methods, including the use of metabolism, which except for luminal degradation requires absorption, is prudent and encouraged.

    Original languageEnglish
    Pages (from-to)1847-1851
    Number of pages5
    JournalMolecular Pharmaceutics
    Issue number6
    StatePublished - 4 Jun 2012


    • biopharmaceutics classification system
    • fraction dose absorbed
    • intestinal permeability
    • oral absorption


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