What is Nasonex?

Nasonex is a corticosteroid nasal spray used to treat symptoms of hay fever, perennial allergic rhinitis, and nasal polyps. Each spray delivers 50 micrograms of mometasone furoate, the active ingredient.

How does Nasonex work?

Mometasone furoate is a steroid that reduces inflammation in the nasal passages. By calming swelling and irritation, it helps ease blocked nose, sneezing, itching, and runny nose. For nasal polyps, it can shrink their size and relieve congestion.

When to consider Nasonex

If you experience seasonal allergies such as hay fever.
For year-round nasal allergies triggered by dust, pets, or mould.
If you have nasal polyps that cause persistent congestion.
It is suitable for adults and children over 12 years for allergic rhinitis, and in some cases for children aged 6–11 under medical advice.

Who should use Nasonex

Adults and children with moderate to severe nasal allergy symptoms.
Adults with nasal polyps confirmed by a doctor.
Who should not use Nasonex

Anyone allergic to mometasone furoate or other ingredients in the spray.
People with untreated nasal infections or frequent nosebleeds.
Individuals who have recently had nasal surgery or injury should wait until healing is complete.

Alternatives to Nasonex

Other corticosteroid nasal sprays such as Flixonase (fluticasone), Beconase (beclometasone), or over-the-counter antihistamine tablets and eye drops may be used depending on symptoms.

Can you buy Nasonex over the counter?

In the UK, some mometasone nasal sprays are available from pharmacies, but higher-dose treatments for polyps usually require a prescription.

How to use Nasonex

1. Shake the bottle before use.
2. Prime the spray if using for the first time or after a few days without use.
3. For allergic rhinitis: the usual dose is two sprays in each nostril once daily.
4. For nasal polyps: adults may be advised two sprays in each nostril once or twice daily.
5. Always follow the instructions given by your prescriber or the patient leaflet.

Active Ingredient: Mometasone furoate

Inactive Ingredient: Dispersable cellulose (microcrystalline cellulose and carmellose sodium), Glycerol, Sodium citrate, Citric acid monohydrate, Polysorbate 80, Benzalkonium chloride,, Purified water

Always check the patient information leaflet (PIL) in your pack for the full ingredient list — especially if you have allergies or sensitivities.

Possible side effects

Most people tolerate Nasonex well.

Common side effects include:

• Nosebleeds
• Headache
• Sore throat or nasal irritation

Less common side effects

• Include cough
• Dry nose
• Unpleasant taste or smell
  
  

Rarely, allergic reactions or changes in vision may occur.