Fig. 1.

The Easyhaler device (on the left). (1) During an inhalation, air enters the device through a small vent and encounter high resistance due to the small size of the opening; (2) High resistance generates a turbulent air flow to the dosing cup; (3) Turbulent air flow ensures de-aggregation of the drug particles and high-dose emission even with low inhalation flows. On the right, the six drugs available with the Easyhaler device are shown