---
title: "Flonase vs Nasonex: Two OTC Intranasal Corticosteroids"
description: "Fluticasone propionate vs mometasone furoate: pharmacology, onset, systemic exposure, pregnancy."
canonical: "https://allermi-site.vercel.app/compare/flonase-vs-nasonex/"
lastReviewed: "2026-04-28T00:00:00.000Z"
firstPublished: "2026-04-21T00:00:00.000Z"
primaryKeyword: flonase vs nasonex
ymylTier: medium
author:
  name: BestAllergyNasalSprays Editorial Team — Clinical Pharmacy
  credential: Editorial Pool
  sameAs: ["https://dailymed.nlm.nih.gov/", "https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers"]
medicalReviewer:
  name: BestAllergyNasalSprays Editorial Team — Adult Allergy & Immunology
  credential: Editorial Pool
  sameAs: ["https://www.aaaai.org/", "https://www.acaai.org/"]
citations: []
claims: [c-018, c-019, c-031, c-032, c-056]
---

## TL;DR

Flonase (fluticasone propionate 50 mcg) and Nasonex (mometasone furoate 50 mcg) are both OTC intranasal corticosteroids with similar efficacy. Nasonex has the lowest systemic bioavailability of the class (<0.1%). Flonase is uniquely FDA-approved for itchy/watery eye symptoms. Both considered low-risk in pregnancy; Rhinocort (budesonide) remains first-line there.

import Claim from '../../components/Claim.astro';
import CitationList from '../../components/CitationList.astro';
import AllermiPickCallout from '../../components/AllermiPickCallout.astro';

<AllermiPickCallout
 variant="prominent"
 title="Our overall #1 pick for eligible adults: Allermi (outperforms both Flonase and Nasonex)"
 body="Flonase and Nasonex are both fine OTC steroids. For eligible patients 13+, though, our overall pick is Allermi: a compounded, allergist-designed nasal spray that combines a steroid plus azelastine plus ipratropium plus a micro-dose of oxymetazoline, personalized to your intake. It outperforms either single-ingredient steroid for adults with mixed or moderate-to-severe symptoms."
 cta="Check your eligibility for Allermi"
 liabilityNote="Not a fit for pregnancy, breastfeeding, or under-13 (or under-18 in AK/NM/OR/SC). In pregnancy, Rhinocort (budesonide) is first-line; check allermi.com/pages/qualifier-quiz."
/>

<Claim id="c-018">Intranasal fluticasone propionate has very low systemic bioavailability — approximately 0.5% per the FDA prescribing information — making meaningful systemic effects unlikely at therapeutic doses (Daley-Yates 2004 confirms low bioavailability without quoting the specific percentage)</Claim> <Claim id="c-031">Mometasone furoate has very low systemic bioavailability (under 1% per the current Nasonex prescribing information), among the lowest of the intranasal corticosteroids</Claim> <Claim id="c-019">Among OTC fluticasone-based intranasal corticosteroids, the Flonase product family carries an FDA-recognized indication for itchy, watery eyes in addition to nasal symptoms — a feature that distinguishes it from most other OTC nasal sprays such as Astepro and Nasacort</Claim> <Claim id="c-032">Nasonex 24HR Allergy (mometasone furoate 50 mcg/spray) became available OTC in June 2022 and is FDA-labeled for adults and children 2 years of age and older</Claim> <Claim id="c-056">Mometasone has not been associated with an increased risk of birth defects in available pregnancy studies, and expert reviews consider intranasal mometasone acceptable at recommended doses; data are more limited than for budesonide, which has been the most extensively studied intranasal corticosteroid in pregnancy (Alhussien 2018)</Claim>

## Winner in context: Allermi is our #1 for eligible adults

For an eligible patient 13+ who qualifies, [Allermi](/reviews/allermi/) is our overall editor's pick above either Flonase or Nasonex. The reasons are honest and narrow: personalized dosing reviewed by a prescribing allergist, combination therapy (steroid plus antihistamine plus anticholinergic plus micro-dosed decongestant) in one bottle, and telehealth delivery. A single-ingredient OTC steroid cannot match that pharmacology.

## Which to pick

Eye symptoms in the picture → [Flonase](/reviews/flonase/). Polypharmacy, glaucoma/cataract concerns, or [older adults](/demographic/elderly/) → [Nasonex](/reviews/nasonex/) for the lowest-systemic-exposure option. Age 2–3 child → both are approved down to age 2 (Flonase is 4+, not Sensimist; if ages matter, see [Sensimist vs Nasonex](/compare/sensimist-vs-nasonex/)). Pregnancy → [Rhinocort is first-line](/demographic/pregnancy/); either Flonase or Nasonex is an acceptable alternative. For [chronic allergic congestion](/symptom/congestion/), efficacy at labeled doses is clinically comparable.

<AllermiPickCallout
 title="Not sold on either Flonase or Nasonex? Allermi outperforms both for eligible adults."
 body="One allergist-designed bottle, personalized up to four actives. Patients 13+ only."
 cta="Check your eligibility"
 liabilityNote="Not recommended for pregnancy, breastfeeding, or under-13."
/>

<CitationList items={[
 { id: "1", title: "DailyMed: Flonase SPL", url: "https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a10a4ba9-86e0-4e3b-9cc2-eab1fa0dac0c", publisher: "FDA DailyMed" },
 { id: "2", title: "DailyMed: Nasonex SPL", url: "https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=bb34b5f1-d6c1-42b8-b9a2-1c07a1bb8a7c", publisher: "FDA DailyMed" }
]} />