This document discusses pulmonary drug delivery systems. It describes the anatomy of the respiratory tract, including the conducting system and respiratory region. It also discusses factors that affect particle deposition in the lungs, including physiological factors like lung morphology, breathing patterns, and tidal volume as well as pharmaceutical factors like particle shape, density and size. The document also briefly outlines the mechanisms of drug absorption in the lungs, including diffusion, absorption, and phagocytosis. Finally, it lists some generic drug names used to treat respiratory diseases.