Compare Allegra vs. Nasonex

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Allegra
(Fexofenadine)

Nasonex
(Mometasone)

Treats allergy symptoms. Allegra (Fexofenadine) relieves allergy symptoms without making you feel drowsy.Relieves allergy symptoms. Nasonex (Mometasone) is a good first-choice treatment for stuffy and runny noses caused by allergies.
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Reviews & ratings
Button Group. All currently active
Button Group. All currently active
5.2727272727272725Allegra
Reviews for Allegra (Fexofenadine)
77%
of people say Allegra (Fexofenadine) is worth it
59%
say it works well
0%
say it's a big hassle
Reviews for Nasonex (Mometasone)
68%
9% vs. Allegra (Fexofenadine)
38%
21% vs. Allegra (Fexofenadine)
8%
8% vs. Allegra (Fexofenadine)
Side effects
AllegraNasonex
  • Vomiting 3%
  • Headache 3%
  • Cough 3%
  • Back pain 2%
  • Ear, nose, or throat infection 2%
  • Diarrhea 1%
  • Fever 1%
  • Runny nose 1%
  • Dizziness 1%
  • Stomach discomfort 1%
More Allegra side effects »
  • Nosebleed 8%
  • Headache 4%
  • Viral infection 3%
  • Menstrual cramps 2%
  • Sinus inflammation 2%
  • Musculoskeletal pain 2%
  • Sore throat 2%
  • Coughing 1%
  • Vomiting 1%
More Nasonex side effects »
How it works
AllegraNasonex
Allegra (Fexofenadine) is an antihistamine. It blocks histamine, a chemical that causes congestion, itching, and other allergic reactions.Nasonex (Mometasone) is a topical steroid. It works directly where it's applied to help reduce swelling and inflammation in your nose.
Type of medication
AllegraNasonex
Antihistamine
2nd generation
Prescription or OTC
Anti-inflammatory
Corticosteroid
Prescription only
Available as
AllegraNasonex
  • Pill
  • Dissolving tablet
  • Liquid
  • Nasal spray
Used for (click to learn more)
AllegraNasonex
Risk factors for serious side effects
AllegraNasonex
  • Taking with alcohol
  • Taking other medicines that make you less alert
  • History of phenylketonuria (PKU)
Detailed Allegra (Fexofenadine) risks & warnings »
  • Long-term use
  • Long-term use
  • Surgery or trauma to the nose or sinuses
  • Long-term use
  • Exposure to immunizable diseases (chickenpox and measles)
  • Exposure to tuberculosis
  • Long-term use
  • Taking more than recommended dose
Detailed Nasonex (Mometasone) risks & warnings »
Pregnancy category
AllegraNasonex
CFDA pregnancy category (Weigh risks vs. benefits)

Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

See the FDA package insert
CFDA pregnancy category (Weigh risks vs. benefits)

Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

See the FDA package insert
Alcohol
No specific alcohol-related info.No specific alcohol-related info.
Food
No specific food-related info.No specific food-related info.
Kidneys and liver
  • The dose needs to be adjusted for people with kidney problems.
No specific kidneys and liver-related info.
Sex
No specific sex-related info.No specific sex-related info.
Sleep
  • Won't make you feel drowsy like some antihistamine medicines.
No specific sleep-related info.
Weight
No specific weight-related info.No specific weight-related info.
Upsides and benefits
AllegraNasonex
  • Relieves allergy symptoms, like sneezing, runny nose, and itching.
  • Approved to be used in kids and adults age 6 months and older.
  • Won't make you feel drowsy like some antihistamine medicines.
  • Available over-the-counter without a prescription.
  • Comes in many forms, such as a tablet, liquid, or quick-dissolving tablet.
  • It's okay to take with most other medications since it has very few interactions.
  • First-choice medication for treating runny and stuffy noses caused by allergies. It works by reducing inflammation in the nose.
  • Because it's used directly where the inflammation is happening, it has fewer side effects than oral steroids do and has a lower chance of causing withdrawal symptoms once the medication is stopped.
  • Can be used as needed to help control symptoms in people age 13 years or older.
  • Available as a generic, which is cheaper.
Downsides and risks
AllegraNasonex
  • For some people, the effects Allegra (Fexofenadine) has on allergies will wear off over time.
  • May not work as well as the first-generation antihistamines, like diphenhydramine (Benadryl).
  • The dose needs to be adjusted for people with kidney problems.
  • Needs to be primed 10 times before it can be used, or re-primed if not used for more than 2 weeks.
  • Doesn't have a counter on it, so it can be hard to remember how many sprays are left (each bottle has 120 sprays).
  • Since the medicine in Nasonex (Mometasone) is a steroid, it can slow down your healing process if you've hurt your nose or had nose surgery.
Tips from our pharmacists for people taking the medication
AllegraNasonex
  • Starts working in 1 to 2 hours depending on what dosage form you're taking.
  • Works best when taken regularly, even before symptoms are expected to appear.
  • Can make you feel dizzy or sleepy, so you can take it at bedtime.
  • Follow age-specific dosing and don't take more than recommended.
  • If symptoms get worse or you need to use it for more than a few weeks, talk with your doctor.
  • Use Nasonex (Mometasone) once a day, following age-specific recommendations on how many sprays to use. Don't take more than prescribed.
  • Blow your nose before using.
  • Can cause thrush (a fungal infection) inside your nose and throat. Can also cause nosebleeds, a sore throat, and headaches.
  • Needs to be used regularly during allergy season for it to work. It can take 1 to 2 weeks for the medicine to start working fully.
  • Check with your doctor or pharmacist on how to use the nasal spray the right way.
  • Shake well before using it. Before the first use, prime the bottle by spraying it until you see a fine mist.
Learn more
More about AllegraSide effectsReviews & ratingsAlternativesFDA package insert
More about NasonexSide effectsReviews & ratingsAlternativesFDA package insert