About the Drug

Allegra (fexofenadine) is used to treat seasonal allergy symptoms and to relieve urticaria (hives). Allegra is an antihistamine and works by blocking the effects of histamine which cause the allergy symptoms.

Use of Information is providing this information solely & freely for educational purposes. Always seek professional consult with your healthcare provider if you have any questions or concerns. This information can be used as an educational guide, however not every drug interaction or side effect may be listed.

Proper Usage

Allegra comes in tablet, quick dissolving tablet and liquid form. It’s usually taken once or twice a day.  The tablet should be taken with a full glass of water and not fruit juices such as orange, apple or grape juice. The liquid form needs to be shaken before each use to make sure the medication is fully mixed. When taking the quick dissolving tablet use dry hands to place tablet in mouth and allow it to dissolve without chewing. Do not swallow the dissolving tablet whole. Take Allegra 1 hour before or 2 hours after eating. Allegra needs to be taken at the same time every day to be fully effective. Waiting too long between doses can make your symptoms worse.

What If I Missed a Dose?

In the case that you miss taking your medicine, It is recommended that you take it when you remember. It is NOT advised to “double dose” (taking both your missed dose and your next one). What’s most important is you get back to your medication regime and avoid missing doses without professional consult.

How Can I Store this Medicine?

Keep the medication in the container it came in, tightly closed and away from extreme heat, cold and moisture.

Possible Side Effects

Side effects of Allegra can include the following:

  • dizziness
  • vomiting
  • pain in arms, legs or back
  • cough
  • pain
  • pain during menstration
  • diarrhea
  • headache

The following symptoms should be addressed immediately by calling your physician.

  • hives, rash or itching
  • difficulty breathing/swallowing
  • swelling in any part of the body
  • hoarseness


Avoid taking Allegra with fruit juices and antacids. Tell your doctor if you have ever had kidney disease.

Took an Overdose?

If you or someone you know took an overdose of this medication, then you need to IMMEDIATELY seek medical attention.

Hotline: U.S. National Poison Control 1800-222-1222

Other Drug Interactions

There may be other drugs which interact with Allegra. Tell your doctor about any medications you are taking both prescription and over the counter.