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Rockville, MD
A 40-year-old female asked:

If i have an allergy to one antihistamine, is it more likely to also be allergic to another? even though they r different chemicals?

1 doctor answer3 doctors weighed in
Dr. Linda Green
Pediatric Allergy and Asthma 45 years experience
Not necessarily: Most people will tolerate a different antihistamine even if they had a reaction to another. The exception might be antihistamines such as zyrtec and xyzal (levocetirizine) which are closely related.

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Last updated Aug 3, 2013

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