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About Product
This content has been written and checked for quality and accuracy by
Mohamed Imran Lakhi Content Administrator GPhC: 2060586 Updated on: 26/05/2020 Next review: 26/11/2020

What is Nasonex?

Nasonex is a nasal spray which is used o treat the symptoms of nasal allergies (allergic rhinitis), also known as Hay fever.

If your symptoms are affecting your concentration levels or sleeping patterns, speak to your GP about possible treatment.

What is allergic rhinitis?

Allergic rhinitis is an immune response to allergens such as pollen, pet fur, or dust. To those who are sensitive to these allergens, the presence of these within the nostrils causes cells in the walls of the nostrils to release chemicals called histamines.

These chemicals cause inflammation in the mucous membranes of the nose and eyes, resulting in the symptoms of rhinitis. These symptoms include:

  • Coughing
  • Itchy eyes
  • Itchy nose
  • Runny nose
  • Sneezing
  • Sore throat
  • Watery eyes

For some people, avoiding their triggers is relatively simple. Staying indoors when the pollen count is high, or dusting with a damp cloth can help reduce exposure to possible triggers. But such precautions may not be possible by everyone.

If you suffer from rhinitis, but are not sure what triggers the symptoms, speak to your GP about getting an allergy test. This will help to identify possible triggers of your condition so that you can avoid them.

If it is not possible for you to avoid your triggers, and your symptoms are disrupting your sleeping pattern or performance, medicines can be prescribed to keep your symptoms under control.

How does Nasonex work?

Nasonex contains a corticosteroid (steroid) called mometasone. This synthetic hormone prevents cells from secreting the chemical which causes the inflammation. By blocking the inflammatory response in the nose, the associated symptoms clear up.

The nasal spray does not immediately relieve the symptoms of allergic rhinitis, but can prevent the symptoms from occurring through daily use.

How to use Nasonex?

It's important to use Nasonex as instructed by your doctor. Using more Nasonex than prescribed will not make your symptoms go away faster, but may increase your chances of side effects.

Do not take less than the doctor's recommendation as this can cause the treatment to be ineffective in treating your symptoms.

The typical dose of Nasonex for an adult is two sprays in each nostril once daily.

Before using your Nasonex spray for the first time, you need to prime the bottle.

Priming your Nasonex

  1. Shake the bottle gently and remove the nozzle cap.
  2. Place your index finger and middle finger on either side of the nozzle, supporting the base of the bottle with your thumb.
  3. Holding the nozzle away from you, depress the pump 10 times until you see a fine mist.

If you have not used your Nasonex nasal spray for more than 14 days, you need to re-prime the bottle by depressing the pump 2 times until you see a fine mist.

Using your Nasonex

  1. Gently shake the bottle and remove the cap from the nozzle.
  2. Blow your nose gently.
  3. Supporting the base of the bottle with your thumb, place your index finger and middle finger on either side of the nozzle.
  4. Close one nostril by pressing the side of your nose with your finger and push the nozzle into the other nostril. Keep the bottle in an upright position.
  5. Begin to gently breathe in and depress the pump. This will spray the medicine into your nose.
  6. Remove the nozzle from your nose and breathe out gently through your mouth.
  7. Repeat steps 3 to 6 for the other nostril.

Once you have administered your medicine, use a clean tissue or handkerchief to clean the nozzle of the bottle and replace the cap.

Store your medicine away from the sight and reach of children. Do not store the bottle above 25 degrees Celsius.

Further information regarding cleaning and storing your Nasonex nasal spray can be found within the patient information leaflet enclosed with your medicine.

Nasonex side effects and cautions

All medicines carry the risk of side effects, though not everybody will get them. It's important to understand the associated risks with the medication you are taking. Below are the possible side effects of Nasonex, as well as their frequency.

Very common side effects (may affect more than 1 in 10 people):

  • Nosebleeds

Common side effects (may affect up to 1 in 10 people):

  • Headache
  • Nasal ulcers
  • Respiratory tract infections
  • Sneezing
  • Sore nose and throat

Unknown frequency (frequency cannot be determined from data):

  • Blurred vision
  • Cataracts
  • Damage to the partition in the nose which separates the nostrils (septum)
  • Difficulty breathing
  • Increased pressure in the eye (glaucoma)
  • Wheezing

If you experience any of the side effects listed above, speak to your doctor or pharmacist, who may be able to offer advice on treating side effects.

What should I do if I experience an allergic reaction?

If you experience the signs of an allergic reaction to this medicine, stop using Nasonex and seek immediate medical help. Symptoms of an allergic reaction to Nasonex may include:

  • Difficulty breathing
  • Hives
  • Swollen face
  • Trouble swallowing
  • Wheezing

How do I know if Nasonex is safe for me?

Before using Nasonex, speak to your doctor if any of the following apply to you:

  • Injury to the nose
  • Nasal infection
  • Recently nasal surgery
  • Sinus infection
  • Tuberculosis

Nasonex nasal spray contains benzalkonium chloride which may cause nasal irritation.

Frequently asked questions about Nasonex

Can I take Nasonex while pregnant or breastfeeding?

If you are pregnant, breastfeeding, think you might be pregnant or trying for a baby, speak to your doctor before using Nasonex to ensure the treatment is safe for you to use.

Will Nasonex affect my ability to drive or operate machinery?

It is not known whether Nasonex has an effect on the ability to drive or operate machinery.

If you feel dizzy or tired after using Nasonex, it is recommended to avoid driving or operating machinery until you feel well enough to do s

Can I take Nasonex with other medicines?

Tell your doctor if you are taking any other medicines, including prescribed, over-the-counter and herbal medicines. Interactions between medicines can cause undesired effects such as reducing the efficacy of the medicine or exacerbating

Your doctor may advise you to cease other corticosteroid treatment while taking Nasonex.

If you are taking medicines for HIV, such as ritonavir or cobistat, your doctor may wish to carefully monitor you while taking Nasonex.

What do I do if I miss a dose of Nasonex?

If you miss a dose of Nasonex, take it as soon as you remember. Continue taking your treatment as you normally would. Do not take more Nasonex to make up for the missed dose.

What should I do if I take too much Nasonex?

If you take more Nasonex than you should, speak to your doctor. Using steroids for long periods, or in large quantities, can affect some of your hormones.

Is it safe to use Nasonex long term?

Nasonex nasal spray is safe for long-term use. It's important to always follow the doctors prescription.

Table of contents

What is Nasonex?

How does Nasonex work?

How to use Nasonex?

Side effects and cautions

Frequently asked questions


Treatment information

  • Product Name: Nasonex
  • Manufacturer: Merck Sharp & Dohme
  • Active Ingredient(s): Mometasone
  • Administration: Intranasal
  • Presentation: Aqueous suspension
  • Available Strength: 50mcg (per spray)
  • Exemption: Prescription Only
  • Application: Adults with allergic rhinitis
  • Dosage: Two sprays in each nostril daily.
  • Description: A nasal spray to prevent symptoms of allergic rhinitis
  • Drug Class: Corticosteroid
  • Alcohol Consumption: No influence
  • When Pregnant: Inform our prescriber if you are pregnant or intend on becoming pregnant.
  • When Breastfeeding: Inform our prescriber if you are breastfeeding.
Click here to view the Nasonex - Patient Information Leaflet

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