A nebulizer comprising a main body, an atomizer, and a vibrating element. The atomizer comprises a substrate, a main recipient supported by the substrate for containing liquid and having surfaces delimiting the liquid reservoir, and a dosing reservoir arranged on the main recipient so as to delimit a predetermined amount of liquid to be expelled. The dosing reservoir comprises a hollow section defining the predetermined amount of liquid, a solid section, a central section, an orifice membrane plate, and a fluidic channel arranged in-between a bottom surface of the solid section and the flat top surface of the main reservoir so as to create a capillary communication between the hollow section and the orifice membrane plate.