Allegra is an antihistamine. It is used to relieve seasonal allergy symptoms including sneezing, runny nose, itchy nose or throat, and itchy, watery eyes.
Allegra is both an over-the-counter and a prescription medication used to relieve the allergy symptoms of seasonal allergic rhinitis. It is also used to relieve symptoms of urticaria (hives) such as red, itchy raised areas of the skin, including itching and rash .
Allegra is in a class of medications called antihistamines. These works by blocking the effects of histamine, a substance in the body that causes allergy symptoms.
Allegra comes as a tablet, an orally disintegrating tablet, and a suspension (liquid) to take by mouth. It is usually taken with water once or twice a day.
Common side effects of Allegra include headache, back pain, cough, diarrhea, and fatigue.
Allegra can also cause dizziness. Do not drive or operate heavy machinery until you know how Allegra affects you.
How was your experience with Allegra?
Allegra Cautionary Labels
Uses of Allegra
Allegra is a prescription medication used to relieve the following:
- symptoms of seasonal allergic rhinitis in patients 2 years of age and older
- symptoms of urticaria (hives) such as red, itchy raised areas of the skin, including itching and rash, in patients 6 months of age and older.
This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.
Allegra Drug Class
Allegra is part of the drug class:
Side Effects of Allegra
Serious side effects have been reported with Allegra. See the “Allegra Precautions” section.
Common side effects of Allegra in subjects age 12 years and older include the following:
- back pain
- stomach discomfort
- pain in extremities
Common side effects of Allegra in subjects age 6 to 11 years include the following:
- upper respiratory tract infections
- ear infection
Common side effects of Allegra in subjects age 6 months to 5 years include the following:
- runny nose
This is not a complete list of Allegra side effects. Ask your doctor or pharmacist for more information.
Tell your doctor if you have any side effect that bothers you or that does not go away.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Tell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Especially tell your doctor if you take:
- antacids containing aluminum hydroxide and/or magnesium hydroxide such as Maalox
- ketoconazole (Nizoral)
- erythromycin (Ery-tab)
This is not a complete list of Allegra drug interactions. Ask your doctor or pharmacist for more information.
Allegra Orally Disintegrating Tablet (ODT) contains phenylalanine. Patients with phenylketonuria, a rare genetic condition in which the body is unable to process phenylalanine, should talk to their doctor before using Allegra. Allegra products other than ODT formulations do not contain phenylalanine.
Allegra can cause dizziness. Do not drive or operate heavy machinery until you know how Allegra affects you.
Do not take Allegra if you are allergic to Allegra or to any of its ingredients.
Allegra Food Interactions
Fruit juices such as grapefruit, orange, and apple juice may interact with Allegra. Discuss the use of fruit juices with your doctor. Allegra should be taken with water instead.
Before taking Allegra, tell your doctor about all of your medical conditions. Especially tell your doctor if you:
- are allergic to Allegra or to any of its ingredients
- have phenylketonuria (Allegra Orally Disintegrating Tablet (ODT) contains phenylalanine)
- are pregnant or plan to become pregnant
- are breastfeeding or plan to breastfeed
- have decreased kidney function
Tell your doctor about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements.
Allegra and Pregnancy
Tell your doctor if you are pregnant or plan to become pregnant.
The FDA categorizes medications based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.
Allegra falls into category C. There are no well-controlled studies that have been done in pregnant women. Allegra should be used during pregnancy only if the possible benefit outweighs the possible risk to the unborn baby.
Allegra and Lactation
Tell your doctor if you are breastfeeding or plan to breastfeed.
It is not known if Allegra crosses into human milk. Because many medications can cross into human milk and because of the possibility for serious adverse reactions in nursing infants with use of this medication, a choice should be made whether to stop nursing or stop the use of this medication. Your doctor and you will decide if the benefits outweigh the risk of using Allegra.
Take Allegra exactly as prescribed.
Allegra comes as a tablet, an orally disintegrating tablet, and a suspension (liquid) to take by mouth.
Allegra tablets are taken once or twice daily with water.
Allegra Oral Disintegrating Tablets (ODT) are taken once or twice daily with or without water on an empty stomach. Let Allegra ODT disintegrate on the tongue before swallowing. Do not chew Allegra ODT. Do not break or use partial tablets.
- Store Allegra ODT in its original blister package. Do not remove Allegra ODT from the original blister package until the time of administration.
Allegra oral suspension (liquid) is taken once or twice daily. Shake bottle well, before each use.
If you miss a dose, take the missed dose as soon as you remember. If it is almost time for the next dose, skip the missed dose and take your next dose at the regular time. Do not take two doses of Allegra at the same time.
Take this medication exactly as prescribed by your doctor. Follow the directions on your prescription label carefully.
The dose your doctor recommends may be based on the following:
- the condition being treated
- other medical conditions you have
- other medications you are taking
- how you respond to this medication
- your kidney function
- your age
The recommended dose of Allegra (fexofenadine) tablets for the treatment of seasonal allergic rhinitis or urticaria (hives) is:
- adults and children 12 years and older: 60mg twice daily or 180mg once daily
- children 6 to 11 years old: 30mg twice daily
Orally disintegrating tablets
The recommended dose of Allegra ODT (fexofenadine) for the treatment of seasonal allergic rhinitis or urticaria (hives), in children 6-11 years old, is 30mg twice daily.
The recommended dose of Allegra oral suspension (fexofenadine) for the treatment of seasonal allergic rhinitis, in children 2 -11 years, is 30 mg (5mL) twice daily.
The recommended dose of Allegra oral suspension (fexofenadine) for the treatment of urticaria (hives) is:
- children 2 to 11 years old: 30 mg (5mL) twice daily.
- children 6 months to 2 years old: 15 mg (2.5mL) twice daily.
If you take too much Allegra, call your healthcare provider or local Poison Control Center, or seek emergency medical attention right away.
- Store Allegra at room temperature 20–25°C (68–77°F).
- Keep this and all medicines out of the reach of children.
- Foil-blister packs containing Allegra tablets or Allegra orally disintegrating tablets should be protected from excessive moisture.
- Do not remove Allegra orally disintegrating tablets from the original blister package until you are ready to use them.
- Shake Allegra oral suspension bottle well, before each use.