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A member asked:

How much time would it take for an allergic reaction to happen?

A doctor has provided 1 answer

Timing/allergic rxn: An allergic reaction due to an ingestion ( food, medications ) can occur within minutes up to approximately 6 hrs. Reactions to skin contacts ( poison Ivy, chemicals, etc) can occur 24-96 hours after exposure.

Dr Ali agreed

Answered 5/16/2015

3.9k views

Thank

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