Immunotherapy in allergic respiratory diseases.

Much more work is needed to specify the correct indications for immunotherapy in respiratory allergic diseases. Immunotherapy with pollen and mite extracts has shown some clinical efficacy versus placebo in controlled studies in allergic rhinitis and/or asthma. However, controlled studies comparing the cost, the risk factors and the efficacy of immunotherapy versus treatment with antihistaminic drugs, bronchodilators and topical steroids are needed. Additional studies are needed to established the place of immunotherapy in animal danders and mould allergy. In any case, before initiating immunotherapy in respiratory allergy the following questions must be answered: is there sufficient evidence of a close relationship between symptoms and allergen exposure? is it possible to achieve efficient allergen avoidance? is simple drug treatment no sufficient? is there evidence in the literature of effectiveness of IT for this allergen? is the patient able to comply with a long and constraining treatment?