The book has 14 chapters, starting with a brief and interesting history of inhaled drug delivery and covering numerous topics related to drug delivery to the respiratory tract. Three chapters relate to the basic principles of particle behavior and sizing, the influence of structure and function of the respiratory tract on aerosol deposition, and in vitro characterization of aerosols. These chapters provide excellent background on the physical parameters of particles that influence their deposition in various regions of the human respiratory tract. Three more chapters discuss factors that affect clinical outcome, the measurement of the amount of materials deposited in the respiratory tract, and strategies for targeting specific regions in the respiratory tract. The final six chapters discuss devices such as nebulizers, metered-dose inhalers, and dry powder inhalers, which are currently used or being developed to deliver drug aerosols to the respiratory tract. The final chapter addresses compliance with therapies used to treat asthma.