This a review from the Journal of Allergy and Clinical Immunology. It reviews how using the correct asthma medication and using appropriate asthma treatment will prevent asthma attacks or asthma exacerbations. Using inhaled corticosteroids, long acting beta agonists and leukotriene antagonists will control asthma inflammation and eosinophils. The goal is to have great asthma control and that will result in less asthma symptoms and attacks. This will reduce the need for oral steroids, like prednisone. It will also prevent or reduce asthma emergency room visits and asthma hospitalizations.