The titled book is “Textbook of Pathophysiology” (As per PCI regulation). The idea of book originated by authors to convey a combined database for easy understanding of Pathophysiology. This book is intended to communicate information on novel drug delivery techniques, to direct tutors and learners regarding fundamental concepts in pathophysiology. The major aim to write this textbook is to provide information in articulate summarized manner to accomplish necessities of undergraduates as per PCI regulation. This volume is designed not only according to curriculum of undergraduate courses in pharmacy by PCI but also to communicate knowledge on pathophysiology.