Allergies Home > Allegra Side Effects

Most people do not have problems with Allegra, and when they do, the effects are usually minor. Some of the most common side effects are headache, coughing, and respiratory tract infection. Rare side effects of Allegra -- such as sleep problems, allergic reaction, and a rash -- are also possible, but these occur in less than 2 percent of people who take this medication.

An Introduction to Allegra Side Effects

As with any medicine, side effects are possible with Allegra® (fexofenadine hydrochloride); however, not everyone who takes the drug will have problems. In fact, most people tolerate it well. If side effects do occur, in most cases, they are minor, meaning they require no treatment or are easily treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Allegra. Your healthcare provider can discuss a more complete list of Allegra side effects with you.)

Common Side Effects of Allegra

Allegra has been studied extensively in clinical trials. In these studies, side effects are always documented and compared to symptoms that occur in a similar group of people not taking the medicine. This way, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the medicine.
Based on these studies, the most common side effects of Allegra experienced by adults or children include:
  • Vomiting -- in up to 12 percent of people
  • Headache -- up to 10.3 percent (see Allegra and Migraines 
  • Coughing -- up to 3.8 percent
  • Diarrhea -- up to 3.7 percent
  • Respiratory tract infection, such as the common cold or flu -- up to 2.9 percent
  • Drowsiness or fatigue -- up to 2.8 percent
  • Back pain -- up to 2.5 percent (see Allegra and Back Pain)
  • Middle ear infection (otitis media) -- up to 2.4 percent
  • Fever -- up to 2.4 percent
  • Dizziness -- up to 2.1 percent
  • Drowsiness -- up to 1.3 percent
  • Indigestion -- up to 2.1 percent
  • Arm or leg pain -- up to 2.1 percent.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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