• SINGULAIR is used for the treatment of 6 months to 5 year old patients who are not adequately controlled on their medication and need additional therapy. • SINGULAIR may also be used as an alternative treatment to inhaled corticosteroids for 2 to 5 year old patients who have not recently taken oral corticosteroids for their asthma and have shown that they are unable to use inhaled corticosteroids. • SINGULAIR also helps prevent the narrowing of airways triggered by exercise for patients 2 years of age and older.