A DPI device comprising a dispensing chamber (13) for receiving a discrete doseof medicament-containing powder and means for delivering said dose from thedispensing chamber to a patient in an air-flow that passes from the chamber tothe patient via a mouth-piece (3) along a first air passage (4) that comprisesde-agglomerating means, the device additionally comprises a second air passage(5) in fluid communication with the dispensing chamber and the mouth-piece andwhich by-passes the de- agglomerating means and which is located such that itreceives a portion of said air-flow that is free, or substantially free, of powder.
