Do NOT use Allegra if:

• you are allergic to any ingredient in Allegra.

Contact your doctor right away if any of these apply to you.

Some medical conditions may interact with Allegra. Tell your doctor or pharmacist if you have any medical condition, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have kidney problems or trouble urinating.

Some medicines may interact with Allegra. Tell your health care provider if you are taking any other medicines, especially any of the following:

• Erythromycin or ketoconazole because they may increase the risk of Allegra's side effects.

This may not be a complete list of all interactions that may occur. Ask your health care provider if Allegra may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

Important safety information:

• Allegra may cause dizziness. It does not usually cause drowsiness when used under normal circumstances at the recommended doses. However, these effects may be worse if you take Allegra with alcohol or certain medicines. Use Allegra with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
• Do NOT take more than the recommended dose or use for longer than prescribed without checking with your doctor.
• Allegra may interfere with skin allergy tests. If you are scheduled for a skin test, talk to your doctor. You may need to stop taking Allegra for a few days before the tests.
• Use Allegra with caution in the elderly; they may be more sensitive to its effects.
• Allegra should be used with extreme caution in children younger than 6 months old; safety and effectiveness in these children have not been confirmed.
• Pregnancy and breast-feeding: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Allegra while you are pregnant. It is not known if Allegra is found in breast milk. If you are or will be breast-feeding while you use Allegra, check with your doctor. Discuss any possible risks to your baby.

All medicines may cause side effects, but many people have no, or minor, side effects.

Check with your doctor if any of these most common side effects persist or become bothersome:

Dizziness; headache; stomach upset.

Seek medical attention right away if any of these severe side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); earache; fever; severe or persistent coughing or vomiting.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider.