The invention consists of a powder inhalator for administrating medications. The inhalator, according to the invention, has a chamber with a mechanism for opening the medication capsule and an aerodynamic chamber in which the medication particles are separated from the currier capsules. In the aerodynamic chamber. On the opposite side to the mouthpiece opening, there are air inlet ducts which form a multidirectional system of air ducts. The air ducts are shaped in a way which makes the air that flows through them create at least three streams. Due to the intersecting of the air streams the air flow is strongly turbulent even if low speeds are involved. Consequently the separation of the active substance particles form the carrier surface is very effective.