an inhaler for powdery , in particular medical , substances is formed with a suction air channel , which leads to a mouthpiece . the inhaler also has a storage chamber for storing the substance and a linearly moving dosing chamber for apportioning a specified amount of substance from the storage chamber to a transfer point to the suction air flow . the aim of the invention is to obtain a structurally simple solution that makes it possible to eliminate adding an external air flow . to this end , a component of the suction air flow , which is located in the direction of extension of the dosing chamber , empties said dosing chamber .