Abstract: A device is disclosed including ultrasonic nebulising means for providing a mist of a liquid medical solution for the treatment of diseases in the lungs, such as asthma or the like, to a human or animal user, such as a horse, the device including a mist reservoir enclosure for receiving the mist produced by the nebulising means, whereby a mist may be produced to fill the enclosure prior to inhalation thereof. The mist is therefore kept ready for inhalation for a longer period of time instead of being produced only in connection with the actual inhalation, and a more efficient and precise inhalation with finer droplets and less waste of the medical solution is obtained.