FACT: Reactions often occur within minutes, however, the timeframe can vary up to several hours after exposure.
Some people may have a second or biphasic reaction after initial symptoms have resolved from the first reaction and in the absence of any further exposure to the allergen. Biphasic reactions appear to be more likely when the first dose of epinephrine given was delayed. The second reaction can be less severe than the first reaction, the same, or more severe.
Bottom line: Give epinephrine at the first sign of a known or suspected anaphylactic reaction.
Watch our food allergy myths recorded webinar with Dr. Susan Waserman, to find out more facts behind common food allergy myths on food allergens, signs and symptoms, reactions, and more.
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Content is based on information included in our food allergy myths webinar by Dr. Susan Waserman, MSc, MD, FRCPC.
Tags: allergic reaction, mythbuster