A member asked:

Could allergies take a week to react ?

A doctor has provided 1 answer
Dr. Richard Zimon answered

Specializes in Internal Medicine

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

Answered 9/28/2016

3.6k views

Thank

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