several clinical trials confirmed the efficacy of omalizumab in reducing the dise of inhaled and oral steroids and clinical exacerbations in adults and pediatric patients with severe asthma. indeed, significant improvements of pef and fev1 have been observed. particularly, in patients with severe allergic asthma treated with subcutaneous immunotherapy (scit), pre-treatment with omalizumab induces a singificant reduction of scit side effects. these results are encouraging for a maintenance dose in a greater number of patients.