Interfaces are of vital importance to many fields of application, but the phenomena are hard to visualise and the theories are often linked to complex mathematical models. This book, the fifth volume in the Drug Targeting and Delivery book series, provides students and working scientists with a readable text on interfacial phenomena. It does not hide away from the complex issues, but addresses the subject in a manner which will make it accessible to the scientist without previous experience of interfacial science. The book looks at a wide range of pharmaceutical issues, ranging from product development to research linked to in vivo applications.