The various aspects related to the transportation of a pharmaceutical compound to its intended target for the purpose of achieving a specific effect is termed as drug delivery. It consists of different manufacturing techniques, approaches, formulations, storage systems and technologies. The efficiency and safety of a drug are maximized through the application of principles connected to site-specific targeting, route of administration, toxicity, drug preparation and metabolism. Drug delivery focuses on altering the specificity and pharmacokinetics of a drug by formulating it with different excipients, medical devices and drug carriers. Some of the different routes of administration which are considered within this field are sublingual, oral, rectal, inhaled and vaginal. This book discusses the fundamentals as well as modern approaches of drug delivery. Also included herein is a detailed explanation of the science and technology of drug delivery. This book is a vital tool for all researching and studying this field.