Dry powder inhalers (DPIs) have become an essential part of respiratory medication delivery, providing an effective and convenient way to manage chronic respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). These inhalation devices are widely used due to their portability, ease of use, and ability to deliver medication directly to the lungs. In this eBook, we explore emerging trends in inhaled drug delivery, trends in DPIs, the benefits of spray drying, mitigating risk during formulation development, and why particle sizing is critical in all forms of pharma products..