What side effects can Nasonex (mometasone) cause?
Nasonex (mometasone furoate) is a corticosteroid nasal spray used for allergic rhinitis and nasal symptoms. Common side effects are usually mild and can include throat irritation, nose irritation, and nosebleeds.[1]
How common are nosebleeds and nasal irritation?
Nosebleeds (epistaxis) are among the more frequently reported local effects of nasal corticosteroids, along with burning, stinging, or irritation inside the nose.[1] If nosebleeds are persistent or heavy, patients should stop and get medical advice.
What serious side effects should patients watch for?
More serious risks are uncommon but important. Seek urgent medical care for signs of a severe allergic reaction (such as swelling of the face/lips, trouble breathing) or for symptoms of infection that do not improve.[1] Long-term or high-dose steroid use can also increase the risk of effects seen with corticosteroids, including adrenal suppression, but this is less typical with standard intranasal dosing.[1]
Can Nasonex cause fungal infection in the nose?
Yes. Intranasal steroid sprays can increase the risk of local infections, including fungal infections (for example, thrush-like symptoms in the nose or throat) in some people.[1] Contact a clinician if there is worsening pain, unusual discharge, or symptoms that suggest infection.
Who is more at risk for side effects?
Risk can be higher for people using higher-than-recommended doses, using the spray for long periods without clinician oversight, or who have existing nasal irritation or infections. Children may be more sensitive to growth-related concerns from corticosteroids, so clinicians monitor use when it’s long-term.
Are side effects different for adults vs children?
The most common effects (like nose irritation and nosebleeds) can happen in both adults and children. Because systemic steroid effects are a concern with any corticosteroid exposure, pediatric dosing and monitoring matter more when treatment is prolonged.
When should you stop Nasonex and call a doctor?
Call a doctor promptly for:
- Frequent or heavy nosebleeds
- Severe or worsening nasal/throat pain
- Symptoms that suggest infection (especially fungal infection)
- Signs of an allergic reaction[1]
Does Nasonex interact with other medicines in a way that increases side effects?
Nasal steroids can interact with strong CYP3A inhibitors (which can increase steroid exposure in the body), potentially raising the chance of systemic steroid effects. Tell your clinician about all medications you use, including prescription, over-the-counter, and antifungals.
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Sources
[1] https://www.drugs.com/sfx/nasonex-side-effects.html