This book provides a comprehensive overview of the localized drug delivery system landscape. The 10 chapters provide a detailed introduction in polymers, nanostructures and nanocomposites for developing localized controlled drug delivery systems (LCDDSs) in the form of stimuli-responsive delivery systems, targeted drug delivery systems or the combination of both. A discussion on manufacturing techniques, optimization, challenges and adaptation of LCDDSs for the treatment of a wide range of diseases is also included. This simple and informative resource conveys an understanding about designing novel drug delivery systems to students in advanced pharmacology, biotechnology, materials science and biochemistry study programs. Readers will be equipped with the knowledge of regulating drug release rates to get a desired pharmacological profile that helps a researcher to ensure a high therapeutic effectiveness. The detailed information about various drug delivery systems and a compilation of recent literature sources also paves the way for research scholars to construct a drug targeting framework for their research plans.