Allegra is available in brand name and generic (as fexofenadine) forms, and comes in tablets, liquid, and oral disintegrating tablets. The dosage of Allegra is 15 milligrams twice a day for children 6 months to 2 years of age, 30 milligrams twice a day for 2 to 11 years of age, and 60 milligrams twice a day (or 180 milligrams once a day) for ages 12 years and older. Studies don't support higher dosages for the treatment of hay fever, but higher doages may be helpful for certain people with hives.
Allegra starts to work within an hour, so taking Allegra on an as-needed basis can be effective for the treatment of hay fever and hives. Taking Allegra on a daily basis may result in better control of allergy symptoms, however. Studies show that Allegra is nearly as good as Zyrtec at treating hay fever, although Zyrtec appears to be a better medicine for the treatment of hives.
Allegra is very well-tolerated and has a low occurrence of side effects. The most common side effect is headache, which has been reported to occur in approximately 10% of people taking Allegra, and about 7% of people taking placebo in the same study. Unlike many other antihistamines, Allegra has not been shown to cause a significant amount of sedation or fatigue when compared to placebo.
Allegra package insert. Sanofi Aventis Corporation. Website accessed December 31, 2010.
Day J, et al. Allergy and Asthma Proc. 2005;26:275-82.
Day J, et al. Allergy and Asthma Proc. 2004;25:59-68.
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