The invention relates to a dry-powder inhaler, comprising a substantially cylindrical body (210), said body (210) comprising, on the cylindrical wall thereof, a mouthpiece (230) defining the dispensing opening (231) and a loading opening (220) for receiving a capsule (10) containing a dose of dry powder, said body (210) comprising a mobile portion (260) rotatably mounted on said body between two end positions, said mobile portion (260) comprising a central shaft (261), said body (210) containing a substantially annular dispersion chamber (211) about said central shaft (261), said central shaft (261) being hollow and comprising at least one opening (269), such that during inhalation, at least one additional airflow passes through said at least one opening (269) in order to disrupt the inhalation flow, and thus increase the swirling of the powder in the dispersion chamber prior to being inhaled through the mouthpiece (230).Inhalateur de poudre sèche, comportant un corps (210) sensiblement cylindrique, ledit corps (210) comportant sur sa paroi cylindrique dune part un embout buccal (230) définissant lorifice de distribution (231 ), et dautre part une ouverture de chargement (220) pour recevoir une capsule (10) contenant un dose de poudre sèche, ledit corps (210) comportant une partie mobile (260) montée rotative sur ledit corps entre deux positions dextrémités, ladite partie mobile (260) comportant un axe central (261), ledit corps (210) contenant une chambre de dispersion (211) sensiblement annulaire autour dudit axe central (261), ledit axe central (261) étant creux et comportant au moins une ouverture (269), de sorte que lors de linhalation, au moins un flux dair supplémentaire passe à travers ladite au moins une ouverture (269) pour perturber lécoulement du flux dinhalation, et ainsi davantage faire tourbillonner la poudre dans la chambre de dispersion avant son inhalation à travers lembout buccal (230).
