Inhaled therapies form the cornerstone for treatment of patients with asthma and COPD. Evolving technology has resulted in availability of a wide range of devices for delivery of inhaled drugs. The four different delivery systems -- pressurized metered-dose inhalers, slow mist inhalers, dry powder inhalers, and nebulizers -- are unique in design and require distinct inhalational instructions for correct use. This book provides current information about inhalation devices, including their advantages and disadvantages, with guidance for optimal techniques of use. The book emphasizes appropriate selection of inhalation devices based on patient and health care professional factors as well as device attributes that allow selection of the right medication in the right inhalation device at the right time for the right patient.