A DPI device comprising a dispensing chamber for receiving a discrete dose of medicament-containing powder and means for delivering said dose from the dispensing chamber to a patient in an air-flow that passes from the chamber to the patient via a mouth-piece along a first air passage that comprises de-agglomerating means, the device additionally comprises a second air passage in fluid communication with the dispensing chamber and the mouth-piece and which by-passes the de-agglomerating means and which is located such that it receives a portion of said air-flow that is free, or substantially free, of powder.
