Mometasone nasal spray (Nasonex)

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Mometasone nasal spray eases the symptoms of a stuffy, runny or itchy nose (rhinitis).

It may take a few days of treatment before you feel the full effect.

If you are using it for hay fever, start using it 2-3 weeks before the hay fever season begins and use it regularly.

Any side-effects are usually mild.

Type of medicineCorticosteroid
Used forNasal symptoms caused by allergies; nasal polyps
Also calledNasonex®
Available asNasal spray

Mometasone nasal spray is used to ease, rhinitis. This is a condition where the inside of your nose becomes inflamed and irritated. Common symptoms include sneezing, a blocked or congested nose, a runny nose (watery discharge), and an itchy nose. It is commonly caused by allergies, such as hay fever. Mometasone belongs to a group of medicines called corticosteroids. It reduces inflammation and swelling and so relieves the congestion, itching, sneezing, irritation and discomfort of rhinitis.

Mometasone nasal spray is also prescribed as a treatment for nasal polyps. Polyps are small growths inside the nose that can cause symptoms similar to allergic rhinitis.

Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start using mometasone, it is important that your doctor knows:

  • If you have an infection in your nose.
  • If you have recently had any surgery on your nose.
  • If you have tuberculosis (TB).
  • If you are pregnant.
  • If you are taking or using other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
  • If you have ever had an allergic reaction to a medicine.
  1. Read the manufacturer's instructions to make sure you know how to work the spray.
  2. Shake the bottle gently and remove the cap. (Before you use the spray for the first time, activate the spray a few times until you can see a fine mist in the air.)
  3. Blow your nose gently to clear it.
  4. Close one nostril by placing a finger against one side of your nose. Then, using your other hand, put one finger on each side of the nozzle of the bottle and insert the nozzle into your open nostril. Try to keep the bottle upright as you do this.
  5. Breathe in through your nose as you activate the spray. Then remove the nozzle from your nostril and breathe out through your mouth. Repeat if you are using two sprays for each dose.
  6. Repeat the step above in your other nostril.
  7. Wipe the nozzle with a clean tissue and replace the cap. (If the nozzle becomes blocked, you can remove it from the bottle and rinse it under warm water).
  • Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. This will give you a step-by-step guide of how to use the spray, and will also provide you with a full list of the side-effects which you may experience from using it.
  • When you first start using mometasone, it is usual to use two sprays into both nostrils each morning for adults and children over 12 years of age, and just one spray into each nostril each morning for children aged 3-11 years. Once your symptoms are controlled, you may be advised to reduce the dose. Your doctor will advise you how long to use the spray for.
  • If you are using the spray for hay fever, your doctor may recommend that you start using it 2-3 weeks before the hay fever season starts. This is because it takes a few days of treatment before you feel the full effect, so starting before the pollen count rises will help to prevent symptoms from developing.
  • Try to remember to use mometasone spray regularly, even if your symptoms are controlled. If you forget a dose at your usual time, take it as soon as you remember unless your next dose is due. If your next dose is due then have the dose which is due and leave out the forgotten one. Do not 'double up' to make up for a missed dose.
  • Do not use the spray more often, or for a longer period of time, than your doctor has recommended. This can increase the risk of side-effects.
  • If you need to use the spray over several months, your doctor may want to monitor your progress. This is particularly important for children who use the spray.

Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with mometasone nasal spray. You will find a full list in the manufacturer's information leaflet inside your pack. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.

Common mometasone nasal spray side-effects (these affect less than 1 in 10 people)What can I do if I experience this?
Slight bleeding from the nose, nasal irritation or burning, throat irritationIf any of these continue or become troublesome, speak with your doctor
HeadacheAsk your pharmacist to recommend a suitable painkiller

If you experience any other symptoms which you think may be due to the spray, speak with your doctor or pharmacist for further advice.

  • Keep all medicines out of the reach and sight of children.
  • Store in a cool, dry place, away from direct heat and light.
  • Check the label for how long you can use mometasone spray once it has been opened. Do not use or store the spray for longer than this time.

Never take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.

This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.

If you are having an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking.

If you buy any medicines, check with a pharmacist that they are safe to take with your other medicines.

Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you.

If you have any questions about this medicine ask your pharmacist.

Further reading & references

Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.

Original Author:
Helen Allen
Current Version:
Peer Reviewer:
Prof Cathy Jackson
Document ID:
1177 (v25)
Last Checked:
Next Review:
The Information Standard - certified member

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