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Intestinal pH as a factor in selection of animal models for bioavailability testing
Journal of Pharmaceutical Sciences
|October 1, 1975
Summary
Animal models like rats and dogs accurately predict human intestinal pH for drug absorption studies. Rabbits, however, show significant differences, making them unsuitable for human bioavailability correlations.
Area of Science:
- Pharmacokinetics and Drug Metabolism
- Gastrointestinal Physiology
Background:
- Intestinal pH is a critical factor influencing drug absorption.
- Accurate animal models are essential for predicting human drug bioavailability.
- Previous in situ studies highlighted the impact of intestinal pH on drug absorption.
Purpose of the Study:
- To determine the intestinal pH in three animal species used for bioavailability testing.
- To evaluate the suitability of rat, dog, and rabbit models for predicting human intestinal pH.
Main Methods:
- In situ intestinal pH measurements were conducted in rats, dogs, and rabbits.
- Data were compared to established human intestinal pH values.
Main Results:
- Intestinal pH measurements in rats and dogs showed good correlation with human data.
- Intestinal pH measurements in rabbits did not correlate with human data.
- Significant species-specific variations in intestinal pH were observed.
Conclusions:
- Rats and dogs are suitable animal models for in situ studies of human intestinal pH.
- Rabbits are not appropriate for predicting human intestinal pH and bioavailability.
- Species selection is crucial for reliable animal-to-human extrapolation in drug development.