An upgraded inhalator for powder preparations comprises a main body having an inhalation channel, an external opening accessible by a user, and a tank adapted to receive a dose of powder preparation. The tank is opened to establish communication with the inhalation channel. At least one protuberance protrudes or extends towards the inside of the inhalation channel. Each protuberance defines substantially concave impact surface and is arranged on the opposite side to the external opening. The impact surface of each protuberance intercepts the powder preparation during its crossing of the inhalation channel towards the external opening.
