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Warren, MI
A 16-year-old male asked:

Could allergies take a week to react ?

1 doctor answer6 doctors weighed in
Dr. Richard Zimon
Internal Medicine 59 years experience
Not usually: Usually allergic reactions are immediate . Some allergies are "delayed" somtimes for 24-48 hours for example Poison Oak, Ivy etc (Called "delayed hypersensitivity") Some medications are like the latter (eg Sulfa drugs). Hope this helps Dr Z

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Last updated Sep 28, 2016

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