Generic Allegra - Fexofenadine

A number of side effects occurred in less than 2 percent of people who were taking Allegra - Fexofenadine (or the percentage of these side effects could not be determined). As a result, it is difficult to tell whether these side effects were caused by Allegra or some other factor.

Some possible rare Allegra side effects include but are not limited to:
Sleep problems, including insomnia
Allergic reaction
Painful menstrual periods
Unexplained rash
Nervousness
Swelling of the lips, mouth, or throat
Difficulty breathing.

Final Thoughts on Side Effects Seen With Allegra

You may experience some or none of the side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have side effects from a medicine that you have never tried. Therefore, make sure to let your healthcare provider know if you develop any side effects with Allegra. Also, let your healthcare provider know if you develop something that “just does not seem right.” While it may not be a side effect, your healthcare provider will be able to diagnose and treat the problem.

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.

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 % of people
Headache - up to 10.3 %
Coughing - up to 3.8 %
Diarrhea - up to 3.7 %
Respiratory tract infection, such as the common cold or flu - up to 2.9 %
Drowsiness or fatigue - up to 2.8 %
Back pain - up to 2.5 %
Middle ear infection (otitis media) - up to 2.4 %
Fever - up to 2.4 %
Dizziness - up to 2.1 %
Drowsiness - up to 1.3 %
Indigestion - up to 2.1 %
Arm or leg pain - up to 2.1 %.