Asthma is one of the most common chronic disease worldwide, imposing a substantial social burden on children. Allergic inflammation is responsible for all clinical symptoms of asthma. The effects of allergic inflammation are: bronchial muscle constriction, excessive mucus production, and edema of mucosa, all elements of „asthmatic triad” causing bronchial obturation. Normal lung function is one of the goals of asthma management. In most of the studies the effect of monotherapy on the symptom scores, lung function parameters and bronchial hyperreactivity was assessed.