This book provides an insight into state-of-art developments in pulmonary drug delivery systems. It comprises several chapters covering a wide range of promising technologies and novel materials explored for developing effective pulmonary drug delivery systems. The initial book chapters elucidate role of thin film freezing, supercritical fluid technology, nano-in-micro particles system, crystal-engineered microstructures and porous particles in pulmonary drug delivery. The subsequent book chapters elaborate on various functional excipients such as chitosan, cyclodextrins, and Vitamin E-TPGS to attain local and systemic therapeutic action. There are book chapters focused on diverse novel carrier systems such as hydrogels, quantum dots, metal-organic framework, and prodrug approach. Additionally, book also contains chapters, exclusively dedicated to biologicals and numerical simulation in pulmonary therapeutics.