An intranasal corticosteroid (INCS) considered the most effective pharmacotherapy class for allergic rhinitis. Fluticasone propionate (Flonase) and fluticasone furoate (Veramyst/Flonase Sensimist) reduce nasal inflammation, congestion, rhinorrhea, sneezing, and itching. Recommended as first-line therapy for moderate-to-severe allergic rhinitis by all major guidelines. Available over-the-counter (Flonase). Also effective for non-allergic rhinitis and nasal polyps.
Known hypersensitivity to fluticasone or any component1,2
Recent nasal surgery or nasal septum ulcers (until healed)1,2
The bottom line
Evidence rating strong. Most-documented uses: most effective single-agent therapy for allergic rhinitis, relieves nasal congestion (superior to oral antihistamines for this symptom), reduces sneezing, rhinorrhea, and nasal itching. 10 sources indexed (1998–2025), with 2 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Binds to intracellular glucocorticoid receptors in nasal mucosal cells. The activated complex translocates to the nucleus and modulates transcription of inflammatory genes, suppressing cytokines (IL-1, IL-4, IL-5, IL-13), chemokines, adhesion molecules (ICAM-1, VCAM-1), and inflammatory enzymes. Reduces eosinophil, mast cell, T-lymphocyte, and basophil infiltration in the nasal mucosa. Decreases vascular permeability and mucus gland secretion. Minimal systemic absorption (<2% bioavailability for fluticasone propionate).1,2
Class
Intranasal Corticosteroid
Absorption
Fat-soluble; take with food
Dosing
Dosing & protocol.
Common range
Adults: 1-2 sprays (50 mcg each) per nostril once daily; children >=4 years: 1 spray per nostril once daily; Sensimist: 1-2 sprays (27.5 mcg each) per nostril once daily (as prescribed by your physician)
Recommended form
Nasal spray (aqueous suspension)
Applied intranasally. Systemic bioavailability extremely low (<2% for fluticasone propionate; 0.5% for fluticasone furoate). Shake well before use. Aim spray away from nasal septum. Prime before first use. Regular daily use is needed for maximum benefit, not for as-needed symptom relief.
Safety
Full safety detail.
Side effects
Epistaxis (nosebleed), most common
Nasal dryness or irritation
Headache
Pharyngitis
Unpleasant taste or smell
Nasal septal perforation (rare, with improper technique)
Contraindications
Known hypersensitivity to fluticasone or any component1,2
Recent nasal surgery or nasal septum ulcers (until healed)1,2
Nasal fluticasone usually has low systemic exposure, but CYP3A inhibition can still increase steroid exposure in susceptible patients. Schisandra extract inhibits CYP3A in humans, so concentrated products may increase the risk of systemic steroid effects during chronic nasal fluticasone use.
Recommendation: Use Schisandra cautiously if you use nasal fluticasone daily or at high doses. Watch for steroid excess symptoms such as easy bruising, facial swelling, weight gain, or unusual fatigue, and tell your clinician about the supplement.
St. John's Wort induces CYP3A4, the main pathway that clears fluticasone. With daily nasal fluticasone, this may lower steroid exposure and reduce rhinitis or nasal polyp symptom control, though the effect is likely product- and dose-dependent.
Recommendation: Avoid starting St. John's Wort if nasal fluticasone control is important, or monitor symptoms after any change. If congestion, sneezing, or nasal polyp symptoms worsen after starting St. John's Wort, ask about adjusting therapy rather than simply increasing steroid dose on your own.
Bielory L, Gross GN, Letierce A et al.. Ocular symptoms improvement from intranasal triamcinolone compared with placebo and intranasal fluticasone propionate: A meta-analysis. Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology. 2020
Li S, Xu R, Yu S et al.. Nasal saline irrigation with azelastine-fluticasone nasal spray in moderate-to-severe persistent allergic rhinitis: a randomized controlled trial. Frontiers in allergy. 2025
Holm AF, Fokkens WJ, Godthelp T et al.. A 1-year placebo-controlled study of intranasal fluticasone propionate aqueous nasal spray in patients with perennial allergic rhinitis: a safety and biopsy study. Clinical otolaryngology and allied sciences. 1998
Davis KJ, Hinds D, Motsko SP et al.. Intranasal Fluticasone Propionate Observational Cohort Safety Studies: Reviewing Evidence from Databases on Two Continents. Drugs - real world outcomes. 2016
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