What if allegra doesnt work

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Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Gonzalez-Estrada, A. Allergy Medications During Pregnancy. The American Journal of the Medical Sciences. Sharma, M. H-1 Antihistamines for Chronic Spontaneous Urticaria. Cochrane Database for Systematic Reviews.

Related Articles. Allegra Side Effects and Dosing for Children. Can Allergies Cause Tinnitus? Treatment of Allergic Rhinitis. Taking Zyrtec for Allergies. The Best Medications to Treat Allergies. Safety of long-acting beta-agonists: urgent need to clear the air remains. Eur Respir J. Allergy Ashtma Proceed. Your Privacy Rights. To change or withdraw your consent choices for VerywellHealth. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page.

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I Accept Show Purposes. Table of Contents View All. Table of Contents. How Allergy Drugs Work. Understanding Drug Tolerance. Bronchodilators and Corticosteroids. What to Do. Was this page helpful? Thanks for your feedback! Sign Up.

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Related Articles. Adult-Onset Allergies. Allergy Cough. Regular use of an intranasal corticosteroid is not only safe but also an effective way to reduce use of antihistamines. They take a few days to start working, so you need to be patient. Ask your doctor or pharmacist about using an antihistamine with an intranasal corticosteroid the first few days.

Some intranasal corticosteroids are available over-the-counter. To reduce daytime drowsiness, take an antihistamine in the evening rather than in the morning. It may help you sleep, with drowsy effects wearing off by the next day. Be aware, though, that drowsiness can last longer than you might expect — and that some antihistamines can cause vivid or disturbing dreams.

What many people may not know is that cold and flu medicines marketed to treat runny nose and sneezing usually include first-generation antihistamines — the more sedating types. Because of their sedating effect, cold medicines with antihistamines are labeled for nighttime use.

So if you suspect a dust mite allergy, stop using your humidifier and see if your symptoms improve. People with seasonal allergies often have antibodies that can cause their immune system to overreact to certain foods.

This phenomenon is called cross-reactivity. These problems may only occur during the season in which your allergies are at their worst. Regardless of the season, help minimize your allergy symptoms by keeping all these triggers in mind and avoiding them as much as possible.

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Mayo Clinic offers more ways to reduce your exposure to allergens : Avoid yard chores that stir up dust, debris, and pollen. Ask someone to do your yard work and other chores during peak pollen season. If you must work outdoors, wear a mask.