Health information to help you understand symptoms. It isn't a diagnosis.
Check symptoms

Mometasone nasal spray

Brand names: Nasonex, Nasonex 24HR Allergy

Mometasone nasal spray calms nasal swelling to relieve allergy symptoms and shrink nasal polyps.

Brand namesNasonex, Nasonex 24HR Allergy
Type of medicineNasal steroid spray
Prescription?Over the counter (also by prescription)
ImportantThis page is general information, not a prescription. Don't start, stop, or change a medicine without talking to your provider or pharmacist.

Overview

It works best used every day; full effect may take a few days.

What it's used for

  • Seasonal and indoor allergies
  • Nasal polyps
  • Preventing seasonal allergy symptoms

How to take it

  • Prime the bottle first.
  • Aim slightly away from the middle of the nose.

Your dose depends on your health and other medicines. Always follow your prescription label, and ask your pharmacist if anything is unclear.

Side effects

Common side effects

  • Headache
  • Nosebleeds
  • Sore throat
Call your provider todayFrequent nosebleeds or a sore in the nose
Call your provider todayVision changes

Warnings

  • Children should use it for the shortest time needed.

Other medicines, foods, and alcohol

  • Ritonavir and ketoconazole raise steroid levels.

Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.

Pregnancy and breastfeeding

Ask your provider.

Missed doses, overdose, and storage

If you miss a dose

This medicine is often taken only when needed. If you take it on a schedule, take a missed dose when you remember, unless it's almost time for the next one. Don't double up.

If someone takes too much

Call Poison Control at 1-800-222-1222 or get help online at poison.org. Call 911 if the person collapses, has a seizure, has trouble breathing, or can't be woken.

Storing it

Store at room temperature, away from heat and moisture (not in the bathroom), and out of reach of children and pets.

Conditions it's used for

Sources

Last updated 2026-11-13.