a body (10) provided with a dispenser orifice (15) at least one reservoir containing a dose of fluid, such as pharmaceutical powder movable support means (50) that receive at least one reservoir, and that are displaceable between a non-dispensing position and a dispensing position reservoir-opening means (80) for opening a reservoir when said opening means are actuated stressing means for urging said movable support means towards said dispensing position, said stressing means including an elastically-deformable stressing element (51) blocking means (100) for retaining said movable support means in the non-dispensing position corresponding to a cocked position of said blocking means and inhalation trigger means for releasing said blocking means and for enabling said movable support means, together with a reservoir, to be displaced towards said dispensing position at the time a user inhales the device including means (700) for modifying the inhalation flow of the user, which means, at the start of inhalation, are adapted to use the inhalation flow mainly to actuate said inhalation trigger means, and, at the end of inhalation, are adapted to use the inhalation flow mainly to expel the dose of fluid contained in the open reservoir.
