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A member asked:
Are antihistamines ever known to bring out the hives they r being taken to prevent? my hives get bumped up within 90mins of any antihistamine.
A doctor has provided 1 answer
No: Depending what antihistamine you are taking, they usually take 30 to 45 minutes to start working, your hives do not worsen from them but if you are taking the medicine when the hives have already started, they are not controlling them very well. See an allergist and they can guide your treatment better.
Answered 12/29/2013
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