Dry powder inhaler (100 200), having a body ( 110 210) containing a dispersion chamber ( 111 2 11), a dispensing orifice (13 1 23 1) through which the user inhales, a loading opening (121 220) receiving a capsule (10) containing a dose of dry powder to be inhaled, and at least one movable part (130 260) that can move with respect to said body between a first end position and a second end position, said dispersion chamber ( 111 2 11) containing at least one part ( 11, 12) of an empty capsule at the moment of inhalation, said at least one capsule part swirling within said dispersion chamber during the inhalation in order to disperse and/or deagglomerate the powder.
