An inhaler is disclosed wherein medicament in a flat-bottomed container is aerosolized with a vibrator piezoelectric transducer. The transducer is driven by a signal that excites multiple harmonic frequencies to create a complex pattern of oscillations. A circuit for generating the drive signal to the transducer is also disclosed.一吸入器係被揭露,其中利用一振動器壓電轉換器將一平底容器內之藥品噴霧化。轉換器被一信號所驅動,該信號激發多諧振頻率來產生振盪的一複雜樣式。亦揭露一用以產生驅動信號至轉換器之電路。