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Epinephrine reactions are rare but predictable in preschool OIT. A large Canadian registry study of nearly 1,900 preschoolers found that only 5.2% needed epinephrine during oral immunotherapy (OIT) for food allergies — and most reactions were mild. Kids with higher baseline IgE, allergic rhinitis, asthma, or those on multi-food OIT faced the greatest risk, especially during the early build-up phase.
Epinephrine reactions are rare but predictable in preschool food allergy treatment
A large prospective Canadian registry study of 1,868 preschoolers undergoing oral immunotherapy (OIT) for food allergies found that only 5.2% required epinephrine — and the vast majority of those reactions were mild. Researchers identified several key characteristics that set higher-risk kids apart, offering clinicians a clearer roadmap for who needs closer monitoring.
Children who needed epinephrine were more likely to have higher baseline food-specific IgE levels, atopic comorbidities (especially allergic rhinitis and asthma), more severe pre-OIT reactions, and were more often receiving treatment for multiple foods simultaneously. The riskiest window? The early build-up phase, when doses range from just 1–20 mg of food protein — not the maintenance phase as some might assume.
By the Numbers
Why it matters: These findings give clinicians actionable guidance — children with higher IgE, multiple food allergies, or comorbid allergic conditions should receive more conservative protocols and closer follow-up. The data also underscores the importance of parental vigilance at home, where a significant share of reactions occurred.
