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Pronunciation: uh-l-EH-g-r-uh
Generic Name: Fexofenadine
The Brand Names are Allegra and Allegra ODT.
Drug Class: Antihistamines

What is Allegra?

Allegra can be described as an antihistamine that minimizes the effects of the natural chemical histamine within the body. Histamine may cause symptoms such as the itching of your nose, sneezing, watery eyes, and a running nose.

Allegra can be used for treating signs of allergies that are seasonal (hay fever) for both children and adults.

In both children and adults, chronic idiopathic urinary tract disease can cause hives and skin itching that can be treated with Allegra.

Allegra is also employed for other purposes that are not covered in this guideline.


If you have a drug allergy, kidney illness, or are on any other medications, talk to your doctor or pharmacist before taking Allegra.Do not consume Allegra with the juice of fruit (such as orange, apple, and grapefruit).

There are other medications that could influence Allegra. Discuss with your doctor all the medicines you take. This includes prescriptions, over-the-counter or vitamin products, as well as herbal products. Don't begin an entirely new drug without consulting your physician.

Stop taking Allegra and seek emergency medical assistance if you suspect you've taken excessive amounts of medication or if you exhibit any of these symptoms as warning signs of an allergic reaction, such as asthmatic hives, breathing difficulties, and swelling of your lips, face, and tongue.

Consult your physician if your symptoms don't improve or if they become worse after taking Allegra. Do not take more than your doctor has prescribed.

Before You Take This Drug

Consult a physician or pharmacist if it's safe to take Allegra if you're intolerant to any drug or have kidney disease.

It is unclear if Allegra can harm an unborn baby. Consult your physician if you are expecting or planning to get pregnant while taking this medication. It is unclear if the fexofenadine is absorbed into breast milk or whether it can harm the nursing infant. Avoid using this medication without letting your doctor know when you breastfeed the baby. Allegra capsules and tablets can serve to manage seasonal allergic symptoms for children who are six years of age or older. The oral suspension of Allegra (liquid) is a possibility for children between the ages of 2 and 11. If you are treating chronic idiopathic urinary tract infections, it is possible to use the liquid employed in infants who are as young as 2 months of age. Don't give this medication to an infant without seeking medical guidance.

The medicine could contain phenylalanine, which can be harmful if you suffer from phenylketonuria (PKU).

How To Take Allegra?

Utilize Allegra strictly as per the directions on the label or as directed by your physician. Avoid using larger doses or for longer periods than prescribed.

Take the normal tablet by drinking a full cup of water. Do not mix it with any other liquid. The oral suspension should be shaken thoroughly before you take a dosage. To ensure you receive the right dose, you should measure the liquid using a measuring spoon marked with a marking or medicine cup, but not a tablespoon. If you don't have an instrument for measuring doses, request one from your pharmacist.

To consume fexofenadine by mouth as disintegrating tablets (Allegra ODT):

  • Place the tablet in its blister package until you are ready to consume the medication. Then, open the pack and peel back the foil that was inside the tablet's blister. Don't push the tablet through the foil, or you could cause damage to the tablet.

  • With clean hands, take the tablet from the packaging and put it in your mouth. The tablet will start to dissolve immediately.

  • Don't swallow the tablet in its entirety. Allow it to dissolve in your mouth without chewing.

  • Take a few gulps as the tablet disintegrates. If you want, you can take a drink to help you swallow the tablet after it has disintegrated.

Consume the Allegra disintegrating tablet with a full stomach at least one hour prior to or two hours after eating.Consult your physician if your symptoms don't improve or if they get worse after taking Allegra. Don't exceed the dose recommended.

Keep Allegra in a cool, dry place, away from heat and moisture. The medicine bottle should be kept securely sealed.

What Happens If I Miss a Dose?

Allegra is used in times of need. If you're following a regular dosing regimen, take a break from any missed dose. Do not use two doses at one time.

What Happens If I Overdose?

For medical emergencies, seek emergency medical attention or contact the Poison Help line toll-free at 1-800-222-1222.

The symptoms of an overdose can include dizziness, dry mouth, or tiredness.

What Should be Avoided?

Don't consume Allegra by drinking fruit juice (such as orange, grapefruit, or apple). These juices may make it more difficult for your body to absorb fexofenadine.

Do not take an antacid for more than 2 hours prior to or after you have taken Allegra. Don't take it. Allegra is taken at the same time as an antacid that contains aluminum or magnesium.Talk to your doctor or pharmacist before taking any other cold or cough medications that may have similar components.

Side Effects Of Allegra

Contact a medical professional immediately. If you experience any of these symptoms warnings of an allergic reaction to Allegra, such as hives, trouble breathing, and swelling of your lips, tongue, throat, or face, Take a break from Allegra and consult your physician for chills, fever, body aches, coughing, or any other flu-like symptoms.

Less significant Allegra adverse effects could include:

  • Nausea, diarrhea, upset stomach;

  • Menstrual cramps;

  • Fatigue, drowsiness;

  • Headaches, 

  • Back or muscle pain or back

This isn't an exhaustive list of possible side effects, and other side effects could be present. Consult your physician for advice regarding medical effects. You can report adverse reactions to the FDA at 1-800-FDA-1088.

Interaction with Other Drugs

Before taking this medicine, inform your doctor whether you are a regular user of other medications that make you sleepy (such as allergy or cold medicines, sedatives and sleeping medications, muscle relaxers, and medicines to treat depression, seizures, and anxiety). They may contribute to the sleepiness that is caused by Allegra.

Inform your physician about any other medicines you are taking, particularly:

  • Ketoconazole (Nizoral);

  • Erythromycin (E.E.S., EryPed, Ery-Tab Erythrocin, Pediazole)

This list isn't exhaustive, and other medications could interfere with Allegra. Inform your doctor about the medications you are taking. This includes prescription, over-the-counter, herbal, and vitamin products. Don't begin any new medication without first talking to your physician.




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