A clinical trial has found that the medication omalizumab, marketed as Xolair, treated multi-food allergy more effectively than oral immunotherapy (OIT) in people with allergic reactions to very small amounts of common food allergens. OIT, the most common approach to treating food allergy in the United States, involves eating gradually increasing doses of a food allergen to reduce the allergic response to it. Thirty-six percent of study participants who received an extended course of omalizumab could tolerate 2 grams or more of peanut protein, or about eight peanuts, and two other food allergens by the end of the treatment period, but only 19% of participants who received multi-food OIT could do so.
Researchers attributed this difference primarily to the high rate of allergic reactions and other intolerable side effects among the participants who received OIT, leading a quarter of them to discontinue treatment. When the participants who discontinued therapy were excluded from the analysis, however, the same proportion of each group could tolerate at least 2 grams of all three food allergens.
The findings were published in an online supplement to The Journal of Allergy and Clinical Immunology and presented at the 2025 American Academy of Allergy, Asthma & Immunology/World Allergy Organization Joint Congress in San Diego on Sunday, March 2, 2025.
“People with highly sensitive multi-food allergy previously had only one treatment option-oral immunotherapy-for reducing their allergic response to moderate amounts of those foods,” said Jeanne Marrazzo, M.D., M.P.H., director of NIH’s National Institute of Allergy and Infectious