Understanding bioavailability is critical to determining the amount of a drug to administer. Integrating physiochemistry with physiology and molecular biology, Oral bioavailability offers a coherent and focused perspective to allow the reader to appreciate all the facets of the complex problem of oral bioavailability, a major hurdle in drug development and delivery. The text helps chemists, biologists, research fellows, pharmaceutical scientists, pharmacologists, and students understand basic barriers to oral bioavailability, be acquainted with the methods used to determine relevant parameters, and comprehend challenges of drug delivery.