Drug delivery comprises formulations, approaches, manufacturing techniques, storage technologies and systems that are involved in the transportation of a pharmaceutical compound towards the targeted site in order to attain the required therapeutic response. It is focused on changing the specificity and pharmacokinetics of the drugs through the formulation of different medical devices, drug carriers and excipients. Furthermore, it places additional weight on enhancing the duration of action and bioavailability of drugs to enhance the therapeutic outcomes. Drug delivery encompasses targeted delivery, controlled-release formulations, drug carriers, 3D printing, nanomedicine, as well as delivery of biologic drugs. The principles associated with the preparation of drugs, route administration, toxicity, metabolism and site specific targeting help in the synthesis, characterization and applications of drug delivery. They are utilized for optimizing safety and efficacy for improvement of patient compliance and convenience. This book includes some of the vital pieces of work being conducted across the world, on various topics related to the synthesis, characterization and applications of drug delivery. It is a resource guide for experts as well as students.