The Back to School asthma study: the effect of montelukast on asthma burden when initiated prophylactically at the start of the school year

Montelukast use was not significantly more effective than was placebo use in reducing the percentage of days with worsening asthma when initiated at the start of the school year. The effect of montelukast treatment on the fall peak in asthma burden may depend on sex, age, and the date of school return.