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What Is Nasonex 24HR Allergy?

Nasonex 24HR Allergy is an over-the-counter nasal corticosteroid spray containing mometasone furoate. It treats nasal symptoms associated with hay fever and other upper respiratory allergies, including congestion, runny nose, sneezing, and an itchy nose. It is approved for adults and children aged two years and older. The medication works locally inside the nasal passages to reduce allergic inflammation.

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What Is Nasonex 24HR Allergy?

Nasonex 24HR Allergy is an over-the-counter nasal corticosteroid spray containing mometasone furoate. It treats nasal symptoms associated with hay fever and other upper respiratory allergies, including congestion, runny nose, sneezing, and an itchy nose. It is approved for adults and children aged two years and older. The medication works locally inside the nasal passages to reduce allergic inflammation.

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How Does Nasonex 24HR Allergy Work?

Nasonex 24HR Allergy contains mometasone, a corticosteroid that reduces inflammation in the nasal lining. During an allergic reaction, inflammatory substances contribute to swelling, mucus production, congestion, and sneezing. Mometasone helps control this response when used regularly. Some patients notice relief within the first day, but full benefit can take several days of consistent use.

What Allergy Symptoms Does Nasonex 24HR Allergy Treat?

Nasonex 24HR Allergy treats nasal congestion, sneezing, a runny nose, and nasal itching caused by seasonal or year-round allergies. Common triggers include pollen, dust mites, pet dander, and mold. The product is not intended to treat bacterial infections or provide immediate emergency relief from severe allergic reactions. Persistent symptoms should be evaluated by a healthcare professional.

How Should Nasonex 24HR Allergy Be Used?

Adults and children aged 12 years and older use two sprays in each nostril once daily. Children aged two through 11 years use one spray in each nostril once daily under adult supervision. Shake and prime the bottle according to the package instructions. Aim the nozzle away from the nasal septum and avoid spraying into the eyes or mouth. Do not exceed the labeled dose.

What Are the Side Effects and Warnings of Nasonex 24HR Allergy?

Possible side effects include nosebleeds, nasal irritation, headache, and sore throat. Nasal corticosteroids can occasionally contribute to nasal infections, impaired wound healing, or eye problems such as glaucoma and cataracts. Long-term corticosteroid exposure can affect growth in children. Consult a healthcare professional about persistent symptoms, frequent nosebleeds, existing eye conditions, or prolonged use in children.

Common Questions About Nasonex 24HR Allergy

Is Nasonex 24HR Allergy a steroid?

Yes. It contains mometasone furoate, a corticosteroid that reduces inflammation inside the nasal passages. It is not an anabolic steroid.

How long does Nasonex 24HR Allergy take to work?

Some symptom relief can occur within the first day, but full improvement can require several days of daily use. Consult a doctor when symptoms do not improve after one week.

Can Nasonex 24HR Allergy be used every day?

Yes. The product is intended for once-daily use according to its label. Children needing treatment for longer than two months per year should be evaluated by a doctor.

Does Nasonex 24HR Allergy treat itchy eyes?

Nasonex 24HR Allergy is labeled to treat nasal allergy symptoms, not as a direct treatment for itchy eyes. A healthcare professional can recommend appropriate treatment for persistent eye allergy symptoms.

References

DailyMed - NASONEX 24HR ALLERGY (mometasone furoate) nasal spray. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=13696a8b-366a-4a5e-adea-d5b7bff9e46f. Date Accessed October 16, 2026.

Mometasone Furoate Monohydrate. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Mometasone-Furoate-Monohydrate. Date Accessed October 16, 2026.

Mometasone Nasal Spray. MedlinePlus. https://medlineplus.gov/druginfo/meds/a602024.html. Date Accessed October 16, 2026.

Nasonex 24HR Allergy - Frequently Asked Questions. Nasonex. https://nasonexallergy.com/pages/faq. Date Accessed October 16, 2026.

Prescription to Nonprescription Switch List. U.S. Food and Drug Administration. https://www.fda.gov/drugs/over-counter-otc-nonprescription-drugs/prescription-nonprescription-switch-list. Date Accessed October 16, 2026.