Bronchodilator combinations are generally inhalers or inhalation devices, which contain more than one bronchodilator, or a bronchodilator and a steroid. Bronchodilator combinations with more than one bronchodilator usually consist of a short acting and a long acting bronchodilator. The bronchodilators may work by different mechanisms to dilate the air passages, and makes air flow easier. Bronchodilator combinations with a steroid and bronchodilator act more like a preventative. Steroids block the body's inflammatory response and effectively improve lung function and reduce asthma symptoms. The bronchodilator in this combination is generally a long acting one and it also acts as a preventer.