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Answer
Allegra (fexofenadine hydrochloride) is classified as Category C in
pregnancy. There are no adequate and well-controlled studies in pregnant
women. Allegra should be used during pregnancy only if the potential
benefit justifies the potential risk to the fetus.
Other oral antihistamines which are Category B (probably safe) include
loratadine (Claritin), chlorpheniramine (ChlorTrimeton),
diphenhydramine (Benadryl), and meclizine (Antivert). Nasal steroid
sprays are an option, but are also Category C, because no reliable
trials have been done in pregnant women.
Keep in mind that ALL medications can pose a risk during pregnancy and
should only be taken if the benefits outweigh the risks.
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