This new book covers recent advancements in the development of controlled drug delivery systems, offering novel perspectives, therapeutics, and strategies for the development of drug delivery, keeping the drug molecule as the central component. The book discusses current theoretical and practical aspects of drug delivery for the discovery and development of novel therapeutics for health problems. Explaining the necessary features essential for pharmacological activity, the volume takes an interdisciplinary approach by including a unique combination of pharmacy, chemistry, and medicine along with clinical aspects. It covers several important drug delivery systems and their chemical structures and pharmacological properties against various human diseases. Topics include the functionalized peptide-based nanoformulations, drug-delivery systems using hydrogel nanocomposite systems, protein-based nanocarriers, aqueous electrolyte solutions in clinical and pharmaceutical research, and more.