Treatment in which oxygen, water, or a drug is introduced into the respiratory tract with inhaled air. It may be used to provide oxygen or to administer drugs to liquefy mucus or dilate the bronchial passageways.
The administration of medicines, water vapor, gases (e.g., oxygen, carbon dioxide, or helium), or anesthetics by inhalation. The medicines usually are nebulized by using an aerosol or spray apparatus.