Background and objective: Specific allergen immunotherapy is believed to be the only treatment able to change the natural history of allergic airway diseases. Sublingual immunotherapy (SLIT) is especially preferred because of its easy application and safety. The aim of this study was to describe the effect of SLIT in pediatric patients who have allergic airway disease.

Methods: Children with asthma and rhinitis who were allergic to house dust mite were evaluated. The effect on clinical course of 3 years of SLIT with 50 % Dermatophagoides pteronyssinus and 50 % Dermatophagoides farinae in a standardized extract was assessed retrospectively.

Results: The records of 39 patients (23 boys, 16 girls) were studied. The mean (± SD) age for starting SLIT was 8.8 ± 2.3 years. The mean number of acute asthma attacks at the onset of the disease was 8.18 ± 3.05. The mean number of attacks after 3 years of SLIT was 0.44 ± 0.79. There was a statistically signifi cant difference in the number of acute asthma attacks before and after therapy (P < .001). Complete clinical remission of asthma was recorded in 37 (95%) patients. Similarly, complete clinical remission of allergic rhinitis was recorded in 32 (82%) patients.

Conclusion: This retrospective study shows that SLIT is effective in children who have allergic airway disease which cannot be controlled effectively with allergen avoidance measures only.

Key words: Sublingual immunotherapy. Asthma. Children.