Allegra Side Effects (Cont.)

Rare Allegra Side Effects

A number of side effects occurred in less than 2 percent of people who were taking Allegra (or the percentage of these side effects could not be determined). 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 (see Allegra and Insomnia)
  • Allergic reaction
  • Painful menstrual periods
  • Unexplained rash
  • Nervousness
  • Swelling of the lips, mouth, or throat
  • Difficulty breathing.
     

Summary of Allegra Side Effects

It is possible that you may experience some Allegra side effects. 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. Also, let your healthcare provider know if you develop something that "just does not seem right." While it may not be an Allegra side effect, your healthcare provider will be able to diagnose and treat the problem.
 
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;