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Nasonex 24HR Allergy

Generic name: mometasonemoe-MET-a-sone ]
Dosage form: nasal spray
Drug class: Nasal steroids

Medically reviewed by Sanjai Sinha, MD. Last updated on Apr 5, 2022.

Nasonex 24HR Allergy is available over-the-counter from a pharmacy.
Nasonex was previously available as a prescription medicine, but is now discontinued.

What is Nasonex 24HR Allergy?

Nasonex 24HR Allergy (mometasone) is a glucocorticoid (steroid). It works by preventing the release of substances in the body that cause inflammation.

Nasonex 24HR Allergy nasal spray is used to treat nasal symptoms of hay fever or other upper respiratory allergies, including nasal congestion, sneezing, runny nose, and itchy nose.

This medicine is approved for this use in adults and children who are at least 2 years old.

Warnings

Nasonex 24HR Allergy is only for use in the nose. Do not spray into your eyes or mouth.

Do NOT use Nasonex 24HR Allergy:

  • in children under 2 years of age
  • to treat asthma
  • if you have an injury or surgery to your nose that is not fully healed
  • if you have ever had an allergic reaction to this product or any of the ingredients.

Mometasone can lower the blood cells that help your body fight infections. Avoid being near people who are sick or have infections. Call your doctor for preventive treatment if you are exposed to chicken pox, measles or tuberculosis. These conditions can be serious or even fatal in people who are using Nasonex 24HR Allergy.

Stop use and ask your doctor if your symptoms do not get better within 7 days of starting use, or you get new symptoms such as severe facial pain or thick nasal discharge. You may have something more than allergies, such as an infection.

Stop use if you get a constant whistling sound from your nose. This may be a sign of damage inside your nose.

Seek medical help right away if you have an allergic reaction to this product.

Stop use and see your doctor if you have new changes to your vision that develop after starting this product, or if you have severe or frequent nosebleeds.

Avoid getting Nasonex 24HR Allergy in your eyes. If this does happen, rinse with water and call your doctor.

Before taking this medicine

You should not use Nasonex 24HR Allergy nasal spray if you are allergic to mometasone.

Tell your doctor if you have ever had:

  • an active or chronic infection;

  • glaucoma or cataracts;

  • herpes simplex virus of your eyes;

  • tuberculosis or any other infection or illness;

  • sores or ulcers inside your nose; or

  • nasal surgery or injury to your nose.

Tell your doctor or health professional if you are pregnant or plan to become pregnant.

It may not be safe for you to breastfeed a baby while you are using this medicine. Ask your doctor or health professional about any risks.

How should I use Nasonex 24HR Allergy?

Use Nasonex 24HR Allergy nasal spray exactly as directed. Follow all directions on the package label and read the package insert.

Do not take by mouth. Nasonex 24HR Allergy nasal spray is for use only in your nose.

Shake the nasal spray well just before each use.

Before your first use, prime the nasal spray pump by spraying the medicine into the air until a fine mist appears. If the nasal spray has not been used for longer than 1 week, prime it by spraying the medicine into the air until a fine mist appears.

To use the Nasonex 24HR Allergy nasal spray:

  • Blow your nose gently. Keep your head upright and insert the tip of the bottle into one nostril. Press your other nostril closed with your finger. Breathe in quickly and gently spray the medicine into your nose. Then use the spray in your other nostril.

  • Do not blow your nose for at least a few minutes after using the nasal spray.

  • Use only the number of sprays recommended.

  • Use this product only once a day. Do not use more than recommended.
  • If the spray gets in your eyes or mouth or on your skin, rinse with water.

  • If the nasal spray has not been used for longer than 1 week, prime it by spraying the medicine into the air until a fine mist appears.

Stinging may occur for a few seconds right after use.

You may start to feel relief within 12 hours, and full effect after several days of regular, once-a-day use.

Do not share the nasal spray with anyone else as this may spread germs.

Store Nasonex 24HR Allergy in an upright position at room temperature, away from moisture and heat. Throw the medicine away after 75 days after first use of the product, even if there is still medicine left in the bottle.

Dosing information

Usual Adult Dose of Nasonex 24HR Allergy for Allergic Rhinitis:

2 sprays in each nostril once a day.

Usual Pediatric Dose of Nasonex 24HR Allergy for Allergic Rhinitis:

2 years to 11 years:
1 spray in each nostril once a day.

12 years or older:
2 sprays in each nostril once a day.

The growth of some children may be slower while using this product. Children should use only for the shortest amount of time necessary to achieve symptom relief. Talk to your child's doctor if your child needs to use the spray for longer than two months a year. Children should use this product under adult supervision. 

What happens if I miss a dose?

Use the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not use two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

An overdose of mometasone nasal spray is not expected to produce life threatening symptoms. Long term use of high doses can lead to thinning skin, easy bruising, changes in body fat (especially in your face, neck, back, and waist), increased acne or facial hair, menstrual problems, impotence, or loss of interest in sex.

What should I avoid while using Nasonex 24HR Allergy?

Rinse with water if this medicine gets in your eyes.

Avoid being near people who are sick or have infections. Call your doctor for preventive treatment if you are exposed to chickenpox, measles, or tuberculosis. These conditions can be serious or even fatal in people who are using steroid medicine.

Nasonex 24HR Allergy side effects

Get emergency medical help if you have signs of an allergic reaction to Nasonex 24HR Allergy: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • severe bleeding or increased drainage from your nose;

  • nose pain or discomfort, headache;

  • white patches or sores in the nose that won't heal;

  • wheezing, trouble breathing;

  • vision problems;

  • ear pain or full feeling, trouble hearing, drainage from the ear.

Steroid medicines such as Nasonex 24HR Allergy can affect growth in children. Tell your doctor if your child is not growing at a normal rate while using Nasonex 24HR Allergy.

Although the risk of serious side effects is low when mometasone is used in the nose, side effects can occur if the medicine is absorbed into your bloodstream. Tell your doctor if you have possible signs of long-term steroid use:

  • weight gain (especially in your face or your upper back and torso);

  • slow wound healing, thinning skin, increased body hair;

  • irregular menstrual periods, changes in sexual function; or

  • muscle weakness, tired feeling, depression, anxiety, or feeling irritable.

Common Nasonex 24HR Allergy side effects may include:

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.

What other drugs will affect Nasonex 24HR Allergy?

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Tell your doctor or pharmacist about all your other medicines, especially:

  • an antibiotic;

  • antifungal medicine;

  • a steroid medicine for asthma, allergies or skin rash;
  • an antidepressant; or

  • antiviral medicine to treat HIV/AIDS.

This list is not complete. Other drugs may interact with mometasone nasal, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

More about Nasonex 24HR Allergy (mometasone nasal)

Patient resources

Other brands
Nasonex, Sinuva

Professional resources

Related treatment guides

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Nasonex 24HR Allergy only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.