Allegra-D contains a combination of fexofenadine and pseudoephedrine. Fexofenadine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
The pseudoephedrine in Allegra-D is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
Allegra-D is used to treat sneezing, runny or stuffy nose, itchy or watery eyes, hives, skin rash, itching, and other symptoms of allergies and the common cold.
Allegra-D may also be used for purposes not listed in this medication guide.
Important information
Do not use Allegra-D if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.
Ask a doctor or pharmacist before using any other cough, cold, allergy, or sleep medicine. Antihistamines and decongestants are contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains an antihistamine or decongestant.
Allegra-D may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Drinking alcohol can increase certain side effects of Allegra-D.
Before taking this medicine
Do not use Allegra-D if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.
Ask a doctor or pharmacist if it is safe for you to take Allegra-D if you have:
FDA pregnancy category C. It is not known whether Allegra-D will harm an unborn baby. Do not use this medicine without a doctor"s advice if you are pregnant.
See also: Pregnancy and breastfeeding warnings (in more detail)
Fexofenadine and pseudoephedrine can pass into breast milk and may harm a nursing baby. You should not breast-feed while using Allegra-D.
How should I take Allegra-D?
Use Allegra-D exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Cold or allergy medicine is usually taken only for a short time until your symptoms clear up.
Do not give Allegra-D to a child younger than 2 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.
Do not crush, chew, or break an extended-release Allegra-D tablet. Swallow the tablet whole.
Call your doctor if your symptoms do not improve after 7 days of treatment, or if you have a fever with a headache, cough, or skin rash.
If you need surgery or medical tests, tell the surgeon or doctor ahead of time if you have taken a cold or allergy medicine within the past few days.
Store Allegra-D at room temperature away from moisture and heat.
What happens if I miss a dose?
Since cold or allergy medicine is taken as needed, you may not be on a dosing schedule. If you are taking Allegra-D regularly, take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid?
Avoid using antacids within 15 minutes before or after taking Allegra-D. Antacids can make it harder for your body to absorb this medication.
This medication may cause blurred vision or impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.
Drinking alcohol can increase certain side effects of Allegra-D.
Ask a doctor or pharmacist before using any other cold, allergy, or sleep medicine. Antihistamines and decongestants are contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains an antihistamine or decongestant.
Allegra-D side effects
Get emergency medical help if you have any of these signs of an allergic reaction to Allegra-D: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using Allegra-D and call your doctor at once if you have:
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pounding heartbeats or fluttering in your chest; or
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severe dizziness, anxiety, restless feeling, tremors, or nervousness.
Common Allegra-D side effects may include:
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mild dizziness;
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dry mouth, nose, or throat;
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nausea; or
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sleep problems (insomnia).
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Allegra-D?
Taking this medicine with other drugs that make you sleepy or slow your breathing can worsen these effects. Ask your doctor before taking Allegra-D with a sleeping pill, narcotic pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.
Other drugs may interact with Allegra-D, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
