Abstract: The invention concerns an ultrasonic atomizer (10), which is intended for an inhalation treatment apparatus for persons suffering from respiratory diseases. The ultrasonic atomizer (10) comprises an atomizer device (11) provided with a drug container (12) as well as an ultrasonic oscillator (13) connected to the container (12), the oscillator preferably comprising an oscillating crystal. The atomizer device (11) is provided with a duct passing into the patient, advantageously a mouth piece and an air-inlet duct (15). The atomizer device (11) comprises a pressure detector (36) directly connected to it or a duct (16) that is connected to the atomizer device (11) and passes to the pressure detector (36) and transmits the pressure of the breathing air. The pressure detector (36) detects the changes in pressure resulting from inhalation or exhalation of the patient, whereby, starting from the beginning of the inhalation stage, atomizing can be switched on by the apparatus.