Disclosed is an inhaler for administering a powdery medicament in the form of an inhalable substance. The medicament is held within a blister cavity to be opened by piercing elements (11). The blister cavity is mounted in the lower part (1) of a housing (2), the housing composed of an upper part (6), designed as mouthpiece and with an inhalation channel (16), and of the lower part, which comprises an air inlet opening (9). The inhalation channel of the upper part of the housing has a unit (15) for dispersing the powdery medicament, with the unit connected to the piercing elements. The unit has a flow bore in communication with an inflow opening so that a turbulent flow is produced in the flow bore prior to entry of the medicament into the inhalation channel. The upper part of the housing can be moved relative to the lower part of the housing in order to open the blister cavity.
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