Nebulising ability of unit designed for maximum efficiency. Removable screw cap. Comes with mask, oxygen tubing and Nebuliser bowl. A Nebulizer is a device used to administer medication to people in the form of a liquid mist to the airways. It is commonly used in treating cystic fibrosis, asthma, and other respiratory diseases. A nebulizer is a machine that uses compressed air to deliver asthma medicine as wet aerosol, a mist that can be inhaled. The most common medications used in a nebulizer are bronchodilators to help open up air passages such as VENTOLINE and IPRATROPIUM.