Nasonex nasal spray for the therapy of allergic reactions and snoring

Nasonex, a prescription nasal spray sold under the generic name Mometason nasal, is used to treat allergies and nasal polyps. It’s a topical steroid spray that relieves nasal congestion and can also help reduce snoring. For this reason, it is sometimes used as an adjunct treatment for snoring and obstructive sleep apnea.What are the possible side effects of using Nasonex? Learn how it works, who shouldn’t use it, and common and potentially serious side effects.

Brandon Peters, MD


Nasonex is used to treat allergic and non-allergic rhinitis, conditions that contribute to nasal congestion, runny , and difficulty breathing through the . If breathing is disturbed during sleep, it can result in snoring, upper airway resistance syndrome, and obstructive sleep apnea. As a result, Nasonex can be helpful in opening your and improving the sleep-related breathing that occurs with these conditions. Nasonex is also used to reduce the size of enlarged tissue in the called nasal polyps.

How it works

Nasonex, a corticosteroid that reduces inflammation in the nasal tissue, is applied as a splash into each nostril. The exact mechanism by which Nasonex works is unknown, but similar to other steroids, it works by reducing chemicals called cytokines in the body. These chemicals are important for the immune system and can be present and cause inflammation after exposure to an allergen.

Who shouldn’t use it

Nasonex should not be used if you have an open wound, sore, or ulcer in your nose as this may affect the natural healing of the wound. It should also not be used if you have an active infection, including tuberculosis or the herpes simplex virus (HSV), or if you have been recently exposed to measles or chickenpox.

There are other conditions for which Nasonex should be used with caution or not at all: Do not use Nasonex with any other corticosteroid medication, and if you have recurrent nosebleeds (called epistaxis) or eye conditions such as glaucoma, cataracts, or disturbances, you may want to go entirely refrain from using it. As it can affect growth in children and adolescents, your pediatrician should be aware of this with prolonged use. If you are taking other medications make sure your prescribing doctor is aware of them to avoid possible interactions.

Side effects

All drugs have the potential for harmful side effects. Most people will not experience any side effects, but some of the most common ones that occur while using Flonase are:

  • a headache
  • Burning or irritation of the nose
  • Nosebleeds (epistaxis)
  • Sore throat
  • Infections (including the eye, ear, and sinuses)
  • to cough
  • Asthma, bronchitis, or wheezing
  • Flu-like symptoms (fever, pain)
  • Chest pain
  • Nausea or vomiting
  • stomach pain
  • diarrhea
  • Pain in joints or muscles
  • Dysmenorrhea (irregular menstruation)

Serious reactions will rarely occur when using Nasonex. The most severe anaphylaxis is associated with difficulty breathing and can be life-threatening. If you take the drug for a long time, these more serious side effects may be less likely:

  • Nasal septal perforation (hole in the cartilage that divides the nasal passages)
  • Nasal ulcer or sore
  • Candida infection of the nose or mouth (candidiasis)
  • Glaucoma or increased pressure in the eye
  • Hypercorticism
  • Adrenal suppression
  • Angioedema
  • Stunted growth (in children)

A word from Verywell

Nasonex may not be a right drug for everyone, so you should discuss with your doctor whether it is the right choice for you. Its safety while breastfeeding is unknown. It is important to monitor growth in children and adolescents using Nasonex.

If you have any questions or difficulties using Nasonex, you should stay in close contact with your prescribing doctor.

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