Abstract: The invention relates to an apparatus for the generation of an exact dose of and making available of an aerosol and which includes: a dispersing nozzle (3) for mixing a liquid containing the effective substance with a gaseous dispersion medium while forming an aerosol, an aerosol drying vessel (4) for buffering and drying the aerosol produced by the dispersion nozzle (3), the aerosol drying vessel (4) being connected to the dispersing nozzle (3) and the aerosol being sprayed from the dispersing nozzle (3) into the aerosol drying vessel 4), a liquid supply apparatus (1) for making available and supplying defined amounts of the liquid containing the effective substance to the dispersing nozzle (3), a dispersion medium supply apparatus (2) for making available and supplying the dispersion medium to the dispersing nozzle (3) at a specified pressure, and a control means (5) connected to the supply apparatus (1, 2) for coordinating and controlling the supply of dispersion medium and the liquid containing the effect