Keep hay fever away with Nasonex nasal spray

Nasonex is a nasal spray that relieves the symptoms of hay fever, nasal blockage and nasal polyps. It contains a corticosteroid that reduces inflammation which can help unblock your nose.

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Strength Quantity Price Stock
50mcg1 spray£27.00In Stock
Prices exclude a prescription fee. This treatment requires a quick online consultation,
which a doctor will review to determine if a prescription is appropriate.

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Virginia Chachati

Reviewed by Virginia Chachati MPharm
(2013, University College London)
GPhC Registration number: 2087654

Information last reviewed 11/02/21


What is Nasonex?

Nasonex is a nasal spray used to relieve hay fever, nasal blockage, and nasal polyps. It contains a type of steroid called a corticosteroid to help reduce inflammation and unblock your nose.

How does Nasonex work?

Nasonex works by reducing the swelling and inflammation in the nose caused by coming into contact with allergens such as pollen, dust mites or animal fur. It also helps unblock your nose and reduce sneezing.

How long will Nasonex take to work?

You should start to see an improvement in your symptoms after twelve hours of using Nasonex, but it can take up to two days to have a full effect.

How long can I use Nasonex for?

Always follow the instructions given by your doctor or pharmacist on how to use Nasonex. Your doctor will advise you on how long you should use Nasonex for. Once your symptoms are under control, see your doctor to discuss reducing your dose.

Is Nasonex a steroid?

Nasonex contains Mometasone, which is a type of corticosteroid. Your body naturally produces anti-inflammatory corticosteroids. These are different from anabolic steroids like testosterone.

What causes hay fever?

Hay fever is an allergic reaction to pollen released into the air by grass, trees and plants. These small pollen particles come into contact with your eyes, mouth and nose. When this happens, your immune system reacts to the pollen by releasing chemicals, such as histamine, which causes hay fever symptoms. You are more likely to have hay fever if: 

  • You have asthma 
  • You have eczema 
  • You have other allergies 
  • You have a family history of hay fever 
  • You were exposed to tobacco smoke as a young child

Who is affected by hay fever?

Hay fever is an allergic reaction to pollen. You can develop hay fever at any age. If you have asthma or any other allergies, you will be more likely to suffer from hay fever. Hay fever can feel worse when it is high pollen season, if it’s windy or if you spend a lot of time outdoors.

Hay fever and asthma

Hay fever can make it more difficult to breathe or trigger shortness of breath in people who have asthma. If this affects you, get advice from your doctor. Your doctor may need to review your preventer inhaler’s dose, prescribe an emergency inhaler, or offer medicines to help control your hay fever.

How to prevent hay fever?

There are steps you can take to prevent hay fever. The main goal is to reduce the amount of pollen you are exposed to. Here are some easy tips you can try: 

  • Apply a small amount of petroleum jelly (like Vaseline) to the inside of your nostrils to catch pollen, and stop it from entering your airways. If you use this method, make sure to rinse out your nose when you get home.
  • Stay indoors when possible if the pollen count is high on the weather forecast.
  • Keep your windows closed.
  • Avoid keeping freshly cut flowers in your home. 
  • Hoover to get rid of dust and pollen regularly. 
  • Dry your clothes indoors instead of outdoors.
  • Avoid inhaling cigarette smoke as this can increase your sensitivity to pollen.
  • Avoid walking across freshly cut grass. 
  • Wear wraparound sunglasses to protect your eyes. 
  • Change your clothes after being outside.
  • Keep your hair covered while outdoors or wash your hair after being outside. 

How do I know if I have hay fever or a cold?

Hay fever is an allergic reaction to pollen and is more likely to happen during high pollen season (spring and summer). A virus causes the common cold, and you can catch a cold at any time of year. With a cold, you may have a sore throat, a cough, body aches or a high body temperature (fever) which you don’t typically experience with hay fever.

How to use Nasonex?

Before you use Nasonex, you'll need to prepare the bottle. First, shake the bottle gently. Then remove the protector cap. Hold the bottle firmly and press the pump ten times. After you get a fine mist, wipe the nozzle and put the protector cap back on.

When you're ready to use Nasonex, shake the bottle and remove the protector cap. Blow your nose and then use your finger to close one nostril. In your open nostril, put the Nasonex nozzle. Tilt your head forward slightly and press down on the pump to release one spray, try to breathe in at the same time. Breathe out through your mouth and then repeat the process if you need to use another spray.


For adults and children over 12 years old, use two sprays in each nostril once a day. For children between 3 years old and 11 years old, use one spray in each nostril once a day.

What should I do if I use too much Nasonex?

Ask your doctor or pharmacist for advice if you use too much Nasonex.

What should I do if I forget to use Nasonex?

If you forget to use Nasonex, do not take a dose to replace the missed dose. Wait until your next dose and take it as prescribed by your doctor.

Side Effects

Possible Nasonex side effects include: 

  • Headaches 
  • Sneezing 
  • Nose bleeds 
  • Sore nose 
  • Sore throat 
  • Ulcers 
  • Respiratory tract infection 
  • Glaucoma 
  • Damaged septum 
  • Altered taste or smell 
  • Difficulty breathing 
  • Blurred vision 

Seek emergency help from a healthcare professional if you experience any of these signs of an allergic reaction: 

  • Swelling of the face or tongue 
  • Difficulty swallowing 
  • Hives 
  • Wheezing 
  • Difficulty breathing


Do not use Nasonex if: 

  • You are allergic to Mometasone or any of the other ingredients in the medicine. 
  • You have a nose infection. 
  • You have recently had a nasal operation or have a nose injury. 

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

  • If you have ever had tuberculosis.
  • If you have an infection.
  • You use additional corticosteroid medicines. 
  • You have cystic fibrosis.

Drug Interactions

Before using Nasonex, tell your doctor or pharmacist about any other medicines you are taking.

Can I use Nasonex alongside Antihistamines?

Always check with your doctor or pharmacist before using Nasonex with another medicine like an antihistamine.

Is Nasonex safe to use during pregnancy?

Speak to your doctor for advice before using Nasonex if you are planning to have a baby or if you are pregnant.

Is Nasonex safe to use while breastfeeding?

Speak to your doctor for advice before using Nasonex if you are breastfeeding. 

Will Nasonex help a cold?

Nasonex can treat hay fever, nasal blockage or nasal polyps but is not recommended to treat a cold. If you feel your cold is not getting better, speak to your doctor or pharmacist for advice.

Treatment Options

Alternatives to Nasonex

There are nasal sprays, eye drops and tablets available over the counter at a pharmacy to help treat hay fever. The medicines include antihistamines and corticosteroids. If over the counter medicines are not effective, or your hay fever symptoms become worse, speak to your doctor. Your doctor may prescribe Nasonex or different medicine to help treat your hay fever. Allergen-specific immunotherapy may be an option if prescription medicines are not effective.

Nasonex vs Rhinocort

Nasonex contains a corticosteroid called mometasone furoate, and Rhinocort contains a corticosteroid called budesonide. Corticosteroids reduce nasal inflammation. Nasonex and Rhinocort are each used at different doses to treat hay fever and nasal polyps.

Nasonex vs Flixonase

Nasonex contains mometasone furoate, which is a different type of corticosteroid than in  Flixonase. Flixonase contains the corticosteroid fluticasone propionate. They are both nasal sprays and help reduce inflammation to ease hay fever symptoms. Nasonex and Flixonase are both prescription-only medicines but are used at different doses. In the UK, their over the counter equivalents are Pirinase (fluticasone propionate) and Clarinaze (mometasone furoate) but are only available for people who are over 18 years old.

How to treat hay fever at home?

Ask your pharmacist for advice on how you can treat hay fever with over the counter medicines such as antihistamine tablets, corticosteroid nasal sprays and antihistamine eye drops. Before you leave home, apply a small amount of petroleum jelly (such as Vaseline) to the inside of your nostrils to catch the pollen and stop it from entering your airways. To avoid hay fever, stay indoors when the pollen count is high on the weather forecast. Also, change your clothes, have a shower and wash your hair after being outdoors.


Can you purchase Nasonex over-the-counter?

Nasonex is only available on prescription and cannot be purchased over the counter at a pharmacy. However, Clarinaze is a nasal spray which also contains mometasone furoate and is available over the counter at a pharmacy, but only for people who are over 18 years old.

When is hay fever season?

Hay fever season often starts in spring, continues throughout summer and tails off in autumn. The pollen count is high during these times of the year as trees, plants and grasses release their pollen into the air. Pollen is an allergen that causes hay fever.


Active ingredients

The active ingredient in Nasonex is mometasone furoate.

Inactive ingredients

The other ingredients include dispersible cellulose, glycerol, sodium citrate, citric acid monohydrate, polysorbate 80, benzalkonium chloride, purified water.

Which ingredients can cause an allergic reaction?

A severe allergic reaction to this medication is rare unless you are specifically allergic to any of the active or inactive ingredients in the spray. Facial/throat swelling, difficulty breathing, chest tightness, a rash, and dizziness are signs of a severe allergic reaction, so get immediate medical attention if you notice these symptoms.

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