Fexofenadine
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
A second-generation antihistamine that is the active carboxylate metabolite of terfenadine. Provides effective relief of allergic rhinitis symptoms and chronic idiopathic urticaria with virtually no sedation or cognitive impairment at recommended doses, considered the least sedating of the second-generation antihistamines. Does not cause QT prolongation (unlike its parent compound terfenadine). Available over-the-counter.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
A second-generation antihistamine that is the active carboxylate metabolite of terfenadine. NutriStack rates the supporting evidence as strong. Common adult dosing is Adults and children >=12 years: 60 mg BID or 180 mg once daily; children 2-11 years: 30 mg BID (as prescribed by your physician), though a prescriber sets the actual dose. This profile indexes 11 sources.
The bottom line
Evidence rating strong. Most-documented uses: treats seasonal and perennial allergic rhinitis, treats chronic idiopathic urticaria, truly non-sedating at recommended doses. 11 sources indexed (2000–2024), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Selectively antagonizes peripheral H1 histamine receptors with high binding affinity and very slow receptor dissociation. Inhibits histamine-induced vasodilation, increased vascular permeability, pruritus, and smooth muscle contraction. Does not cross the blood-brain barrier at therapeutic doses (substrate of P-glycoprotein efflux pump and organic anion transporting polypeptide [OATP]). No significant anticholinergic, anti-alpha-adrenergic, or anti-serotonergic activity. Does not affect cardiac potassium channels (no QTc effect).
Dosing & protocol.
Bioavailability approximately 33%. Do NOT take with fruit juices (apple, orange, grapefruit), they inhibit OATP1A2 organic anion transporting polypeptide, reducing absorption by up to 36%. Take with water. Food has no clinically significant effect on absorption. Avoid high-fat meals which may slightly reduce absorption.
Full safety detail.
Side effects
- Headache
- Drowsiness (near placebo rates)
- Nausea
- Dysmenorrhea
- Back pain
- Upper respiratory symptoms
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
4- 1Clinical Pharmacokinetics of Fexofenadine: A Systematic ReviewPMIDBatool M, Zamir A, Alqahtani F et al. · Pharmaceutics · 2024
Batool M, Zamir A, Alqahtani F et al.. Clinical Pharmacokinetics of Fexofenadine: A Systematic Review. Pharmaceutics. 2024
- 2Update meta-analysis on the efficacy and safety issues of fexofenadinePMIDGómez RM, Moreno P, Compalati E et al. · The World Allergy Organization journal · 2023
Gómez RM, Moreno P, Compalati E et al.. Update meta-analysis on the efficacy and safety issues of fexofenadine. The World Allergy Organization journal. 2023
- 3Safety of fexofenadine and other second-generation oral antihistamines before and after the removal of the prescription requirement in Italy and other European countries: A real-world evidence study and systematic reviewPMIDCarnovale C, Battini V, Gringeri M et al. · The World Allergy Organization journal · 2022
Carnovale C, Battini V, Gringeri M et al.. Safety of fexofenadine and other second-generation oral antihistamines before and after the removal of the prescription requirement in Italy and other European countries: A real-world evidence study and systematic review. The World Allergy Organization journal. 2022
- 4Antihistamine effects and safety of fexofenadine: a systematic review and Meta-analysis of randomized controlled trialsPMIDHuang CZ, Jiang ZH, Wang J et al. · BMC pharmacology & toxicology · 2019
Huang CZ, Jiang ZH, Wang J et al.. Antihistamine effects and safety of fexofenadine: a systematic review and Meta-analysis of randomized controlled trials. BMC pharmacology & toxicology. 2019
Randomized controlled trials
2- 5Correction to: Comparison of the Efficacy and Safety of Bilastine 20 mg versus Fexofenadine 180 mg for Treatment of Perennial Allergic Rhinitis: Randomized Controlled StudyPMIDSinghal A, Agrawal P, Chatterji P et al. · Indian journal of otolaryngology and head and neck surgery : official publication of the Association of Otolaryngologists of India · 2024
Singhal A, Agrawal P, Chatterji P et al.. Correction to: Comparison of the Efficacy and Safety of Bilastine 20 mg versus Fexofenadine 180 mg for Treatment of Perennial Allergic Rhinitis: Randomized Controlled Study. Indian journal of otolaryngology and head and neck surgery : official publication of the Association of Otolaryngologists of India. 2024
- 6Fexofenadine: a review of its use in the management of seasonal allergic rhinitis and chronic idiopathic urticariaSource linkedPMIDSimpson K, Jarvis B · Drugs · 2000
Reviews & position papers
1- 7Fexofenadine: review of safety, efficacy and unmet needs in children with allergic rhinitisPMIDMeltzer EO, Rosario NA, Van Bever H et al. · Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology · 2021
Meltzer EO, Rosario NA, Van Bever H et al.. Fexofenadine: review of safety, efficacy and unmet needs in children with allergic rhinitis. Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology. 2021
Reference material
4- 8Simons FE. Advances in H1-antihistamines. N Engl J Med. 2004.Source linkedPMID
- 9Dresser GK et al. Fruit juices inhibit organic anion transporting polypeptide-mediated drug uptake to decrease the oral availability of fexofenadine. Clin Pharmacol Ther. 2002.Source linkedPMID
- 10Zuberbier T et al. The international EAACI/GA2LEN/EuroGuiDerm/APAAACI guideline for the definition, classification, diagnosis, and management of urticaria. Allergy. 2022.Source linkedPMID
- 11Fexofenadine. 2006Source linkedPMID
Common questions.
Quick answers about Fexofenadine, drawn from the data on this page.
What is Fexofenadine?
A second-generation antihistamine that is the active carboxylate metabolite of terfenadine. Provides effective relief of allergic rhinitis symptoms and chronic idiopathic urticaria with virtually no sedation or cognitive impairment at recommended doses, considered the least sedating of the second-generation antihistamines. Does not cause QT prolongation (unlike its parent compound terfenadine). Available over-the-counter.
What is Fexofenadine used for?
Commonly cited benefits of Fexofenadine include: Treats seasonal and perennial allergic rhinitis; Treats chronic idiopathic urticaria; Truly non-sedating at recommended doses; No QT prolongation risk; No cognitive or psychomotor impairment. NutriStack rates the overall evidence as strong.
What is a typical dose of Fexofenadine?
A typical adult dose of Fexofenadine is Adults and children >=12 years: 60 mg BID or 180 mg once daily; children 2-11 years: 30 mg BID (as prescribed by your physician). The commonly recommended form is Oral tablets, orally disintegrating tablets, or oral suspension. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Fexofenadine?
Reported side effects include headache, drowsiness (near placebo rates), nausea, dysmenorrhea, back pain, upper respiratory symptoms. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Fexofenadine?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Fexofenadine in NutriStack.
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