The rate and extent of drug absorption are a function of many factors, including the site of administration, the physiochemical characteristics of the compound, and the dosage form. The issues involved in bioequivalence and bioavailability are enmeshed in controversy, which is compounded by issues of therapeutic efficacy and equivalence as well as by economic factors. Sixteen contributions discuss study design, species differences, and regulatory perspectives worldwide. Annotation(c) 2003 Book News, Inc., Portland, OR (booknews.com)