In the world of drug development, the meaning of the term "biopharmaceutics" often evokes confusion, even among scientists and professionals who work in the field. "Pharmaceutics" narrowly defined is a field of science that involves the preparation, use, or dispensing of medicines (Woolf, 1981). Addition of the pre- fix "bio," coming from the Greek "bios," relating to living organisms or tissues (Woolf, 1981), expands this field into the science of preparing, using, and administering drugs to living organisms or tissues. Inherent in the concept of biopharmaceutics as discussed here is the interdependence of biological aspects of the living organism (the patient) and the physical-chemical principles that govern the preparation and behavior of the medicinal agent or drug product.