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Martinez, M. et al.

Martinez, Amidon, Clarke, Jones, Mitra, Riviere,

Applying the biopharmaceutics classification system to veterinary pharmaceutical products. Part II. Physiological considerations.

In comparing product bioavailability across animal species, it is not unusual to observe marked interspecies differences. For many compounds, these differences reflect presystemic drug metabolism. However, a host of other variables must also be considered such as in vivo drug solubility, gastric transit time, intestinal permeability, diet, and species-by-formulation interactions. By combining information on drug solubility and intestinal permeability with an understanding of the interrelationship between pH, product dissolution and gastrointestinal physiology, we attempt to define those conditions under which in vitro dissolution data may be used as a surrogate for data on in vivo bioavailability. We consider the likely physiological causes for species-related differences in the absolute and relative bioavailability of orally administered pharmaceuticals, and examine the potential for these normal interspecies differences to reflect bioavailability changes that can occur with various human pathologies.[1]

References

Applying the biopharmaceutics classification system to veterinary pharmaceutical products. Part II. Physiological considerations. Martinez, M., Amidon, G., Clarke, L., Jones, W.W., Mitra, A., Riviere, J. Adv. Drug Deliv. Rev. (2002) [Pubmed]

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