DARU Journal of Pharmaceutical Sciences93-4Design and evaluation of a new dry powder inhaler4649"Rouholamini Najafabadi AHGilani KHozan AA "20151006Three versions of a new dry powder inhaler (DPI), RG-haler, were designed using two kinds of grid inserts. Salbutamol sulfate/lactose blend (Ventolin Rotacaps®) was selected as a model formulation to analyze the performance of all inhalers and compare their efficiency with three marketed devices (Rotahaler®, Spinhaler® and ISF inhalator®) using the twin impinger (TI). Deposition of the drug in device was significantly (Phttps://daru.tums.ac.ir/index.php/daru/article/view/129https://daru.tums.ac.ir/index.php/daru/article/download/129/129