Allegra Side Effects

Most people do not experience side effects from Allegra, and when they do, the effects are usually minor. Some of the most common Allegra 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, there are possible side effects with Allegra® (fexofenadine hydrochloride); however, not everyone who takes this medication will have Allegra side effects. In fact, most people tolerate Allegra well. When 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.
 
(The following list of Allegra side effects is not complete. Your healthcare provider can discuss a more complete list of Allegra side effects with you.)
 

Common Allegra Side Effects

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. Based on these studies, the most common Allegra side effects 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.
     
(Allegra Side Effects Continued: Page 2)
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;
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