The book "Buccal Drug Delivery System" provides a comprehensive analysis of the various approaches to oral buccal drug delivery. It covers the fundamentals and evaluation of buccal drug systems, with a particular focus on mucoadhesive properties and controlled release technologies. The authors A. Pandurangan, Anuj Malik, and Manish Kumar highlight the importance of the blood supply to oral tissues, which is provided by the external carotid artery, and discuss advancements in bioadhesive technology that have increased interest in drug delivery through the oral mucosa. This specialized book is aimed at professionals and students involved in the development and application of drug systems in the field of oral pharmacology.