Home HealthTopics Health Centers Reference Library Research
Join us on Facebook Join us on Facebook Share on Facebook


Delayed allergic reaction



what is the protocol for delayed allergic reaction-greater than one hour?


A delayed allergic reaction is anything more than two hours, actually out to multiple days. It depends on the type of reaction. If you are referring specifically to "classic" allergy, such as a food or drug reaction, the symptoms that can lead to or are termed ANAPHYLAXIS usually happen within 1-2 hours of contact. As with all cases, there are exceptions, but this is the textbook teaching. We will watch someone for two hours after a food or drug challenge to make sure they do not have any symptoms.

For more information:

Go to the Allergies health topic, where you can:

Response by:

David  Hauswirth, MD David Hauswirth, MD
Clinical Assistant Professor
Pulmonary, Allergy, Crtitical Care & Sleep
College of Medicine
The Ohio State University