Nasonex Side Effects

by on June 19, 2012


Nasonex (Mometasone Spray) is a safe and effective treatment option for allergy sufferers. The side effects of Nasonex are usually mild and many people will not have any adverse reactions while taking the medication. The most commonly reported Nasonex side effects include headache, sore throat, and sometimes vomiting. Like many steroid nasal sprays, Nasonex users have an increased risk of developing an infection during treatment with this drug.

Common Nasonex Side Effects

Mild side effects may be experienced by a few Nasonex users when they first start taking the medication. It is rare for any of the symptoms below to become severe. If they worsen, or if the symptoms don’t go away, contact your doctor.

  • Headache
  • Nausea
  • Vomiting
  • Sore throat
  • Stuffy nose
  • Cough
  • Sores or white patches in the nose
  • Muscle or joint pain

Serious Nasonex Side Effects

In very rare cases, patients will experience serious side effects while taking Nasonex. Do not take Nasonex if you are allergic to mometasone. A severe allergic reaction could be life threatening if prompt medical care is not received. Visit your nearest emergency care provider if you have any of these symptoms:

  • Hives
  • Swelling of the face, eyes, or lips
  • Swelling of the tongue or throat
  • Difficulty breathing

Taking Nasonex may reduce the body’s ability to fight off infections. Contact your doctor immediately if you are exposed to measles or chicken pox while you are taking Nasonex. These diseases can be fatal in an individual with a weakened immune system. A small number of people have reported other serious side effects of Nasonex that could be signs of severe conditions. Call your doctor if you experience any of these symptoms:

  • White patches in the nose or throat that are painful and will not heal
  • Symptoms similar to the flu, such as fever, chills, body aches, etc.
  • Vision problems
  • Wheezing
  • Severe nosebleed or a nosebleed that will not stop

This may not be all of the side effects caused by Nasonex. If you experience any unusual symptoms or changes in your physical state, let your doctor know as soon as possible.

Side Effects In Children

Individuals as young as two may be prescribed Nasonex for allergy symptoms. Some studies indicate that the use of steroids in developing children can slow down normal growth. There is a possibility that this side effect of Nasonex could decrease the final adult height of a child who uses the medication for a prolonged time. If your child suffers from allergies, discuss the risks and benefits of Nasonex with his or her doctor before choosing the best treatment.


Classified by the FDA as a pregnancy category C drug, mometasone and Nasonex could be harmful to an unborn child if it is taken during pregnancy, but there isn’t sufficient evidence to know for sure. If you are pregnant or plan to become pregnant, discuss your treatment options with your doctor to choose the best medication for you. Let your physician know if you become pregnant while taking Nasonex. Breastfeeding is not recommended while taking this medication, although it is not definite that mometasone can pass through breast milk.

Existing Conditions

Individuals with certain conditions may be at a greater risk of experiencing adverse side effects with Nasonex. Recent injuries to your nose or nose surgery should be discussed with your doctor before this medication is prescribed. You should also let your doctor know if you currently have any untreated infections. Taking Nasonex may make infections much more serious. Talk to your doctor about using Nasonex if you have any of the conditions below:

  • Tuberculosis, either now or in the past
  • Glaucoma, cataracts, or other eye disorders
  • Herpes simplex virus that affects the eyes
  • Sores, ulcers, or other skin conditions in the nose
  • Liver disease
  • Any other illnesses or infections

Other Medications

Most medications can be safely taken with Nasonex without experiencing any adverse reactions, but you should tell your doctor about all medications, vitamins, and supplements that you are taking on a regular basis. It is very important for your physician to be aware of any other steroid medications you may be taking, including oral steroids, such as prednisone, dexamethasone, etc., and inhaled forms like Flovent and QVAR. The dosage of these medications may need to be adjusted for you to safely take Nasonex.

Nasonex is not always the right allergy treatment option for everyone but for most individuals, it is safe and effective with very few side effects. It is important to wash your hands and avoid contact with individuals who are sick while taking this medication. People who are at a higher risk of infections or who take other medications that weaken or suppress the immune system may want to discuss other options with their doctor. Healthy adults rarely experience Nasonex side effects.