Can you be allergic to Allegra?

Yes, it is possible to be allergic to Allegra (fexofenadine). Although rare, allergic reactions to Allegra and other antihistamines have been reported. Symptoms of an allergic reaction may include hives, swelling of the face, lips, tongue, or throat, difficulty breathing, and dizziness or fainting. If you experience any of these symptoms after taking Allegra, stop taking the medication and seek immediate medical attention.