Fexofenadine

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Fexofenadine on Prescriptsy

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Fexofenadine is a non-sedating antihistamine used to treat hay fever (seasonal allergic rhinitis) and chronic idiopathic urticaria (persistent hives of unknown cause).

It is available as 120 mg tablets for hay fever and 180 mg tablets for urticaria.

Fexofenadine is the active metabolite of terfenadine and belongs to the second-generation antihistamine class, meaning it does not readily cross the blood-brain barrier and is far less likely to cause drowsiness than older antihistamines such as chlorphenamine or promethazine.

It is available as a prescription-only medicine (POM) at the 120 mg and 180 mg strengths, although pharmacists in the UK can now supply fexofenadine 120 mg without a prescription for adults with hay fever.

Allergic rhinitis and urticaria are among the most common allergic conditions in the United Kingdom.

According to Allergy UK, hay fever affects approximately 13 million people across the country, with prevalence rising over recent decades.

Symptoms including sneezing, nasal congestion, runny nose, and itchy, watering eyes can significantly impair quality of life, affecting concentration at work and school, sleep quality, and overall wellbeing.

Chronic idiopathic urticaria, characterised by recurrent itchy wheals (hives) lasting more than six weeks without an identifiable cause, affects approximately 0.5 to 1% of the population and can be particularly distressing.

This page provides a comprehensive clinical overview of fexofenadine, including how it works, who should take it, dosing guidance, potential side effects, important safety information, and how to obtain it in the United Kingdom.

Important safety information about fexofenadine

• Fexofenadine does not usually cause drowsiness, but if affected, do not drive or operate machinery.
• Take on an empty stomach or at least one hour before or two hours after food.
• Swallow with water only. Avoid apple, orange, and grapefruit juice at the time of dosing.
• Do not take antacids within two hours of fexofenadine.
• Seek immediate medical attention if you develop signs of a severe allergic reaction (swelling of face, lips, or throat; difficulty breathing).

Understanding allergic rhinitis and chronic urticaria

Allergic rhinitis occurs when the immune system overreacts to airborne allergens such as grass pollen, tree pollen, house dust mites, animal dander, or mould spores.

When an allergen is inhaled, it triggers mast cells in the nasal mucosa to release histamine and other inflammatory mediators.

Histamine binds to H1 receptors on blood vessels and sensory nerves, causing vasodilatation, increased vascular permeability, mucus secretion, and nerve stimulation.

This produces the familiar symptoms of sneezing, nasal itching, rhinorrhoea (runny nose), nasal congestion, and ocular symptoms (itchy, red, watering eyes).

Seasonal allergic rhinitis (hay fever) is triggered primarily by pollen: tree pollen from late February to May, grass pollen from May to July, and weed pollen from June to September.

Chronic idiopathic urticaria (also called chronic spontaneous urticaria) is defined as the occurrence of itchy wheals (raised, red, swollen patches on the skin), angioedema (deeper swelling), or both, on most days of the week for six weeks or more, without an identifiable external trigger.

The condition is thought to result from autoimmune activation of mast cells in the skin.

Histamine release causes localised vasodilatation, fluid leakage into surrounding tissue, and stimulation of sensory nerves, producing intense itching. Chronic urticaria can significantly affect sleep, mood, and daily functioning.

How fexofenadine works: mechanism of action

Fexofenadine hydrochloride is a selective, peripheral H1-receptor inverse agonist.

It competes with histamine for binding at H1 receptors on vascular endothelial cells, smooth muscle cells, and sensory nerve endings, blocking the vasodilatory, permeability-increasing, and nerve-stimulating effects of histamine.

By occupying H1 receptors without activating them, fexofenadine prevents the cascade of allergic symptoms triggered by histamine release.

A key advantage of fexofenadine over first-generation antihistamines is its inability to cross the blood-brain barrier in significant quantities.

First-generation antihistamines such as chlorphenamine and promethazine readily enter the central nervous system, where they block H1 receptors involved in wakefulness and cognitive function, causing marked drowsiness, impaired concentration, and psychomotor slowing.

Fexofenadine is a substrate of the P-glycoprotein efflux transporter, which actively pumps it out of the brain, maintaining its non-sedating profile.

Studies using positron emission tomography (PET) have confirmed that fexofenadine at recommended doses occupies less than 10% of central H1 receptors, well below the threshold associated with subjective sedation.

Unlike terfenadine (which was withdrawn from the UK market due to cardiac safety concerns), fexofenadine does not inhibit the hERG cardiac potassium channel and carries no risk of QT prolongation, torsades de pointes, or other cardiac arrhythmias, even at supratherapeutic doses.

This excellent cardiac safety profile, combined with its non-sedating properties, makes fexofenadine one of the safest antihistamines available.

Clinical evidence and UK prescribing guidance

Fexofenadine has been extensively studied in randomised, placebo-controlled trials involving thousands of patients with seasonal allergic rhinitis and chronic urticaria.

In hay fever trials, fexofenadine 120 mg once daily significantly reduced total symptom scores (sneezing, rhinorrhoea, nasal congestion, and ocular symptoms) compared with placebo, with onset of action within one to two hours and sustained 24-hour efficacy.

In chronic urticaria trials, fexofenadine 180 mg once daily significantly reduced pruritus (itching), wheal count, and overall symptom severity compared with placebo.

NICE Clinical Knowledge Summary (CKS) on allergic rhinitis recommends oral antihistamines as first-line pharmacological treatment.

Non-sedating second-generation antihistamines (including cetirizine, loratadine, and fexofenadine) are preferred over sedating first-generation agents. For moderate-to-severe or persistent symptoms, combination therapy with an intranasal corticosteroid spray is recommended.

The British Society for Allergy and Clinical Immunology (BSACI) guideline on rhinitis similarly endorses non-sedating antihistamines as a cornerstone of treatment.

For chronic urticaria, NICE CKS and the BSACI/BAD (British Association of Dermatologists) guideline recommend a non-sedating antihistamine as first-line treatment.

If standard doses are insufficient, the dose may be increased up to four-fold (for example, fexofenadine 180 mg up to four times daily) under specialist supervision before escalating to second-line therapies such as omalizumab or ciclosporin.

This updosing strategy is well established in European guidelines (EAACI/GA2LEN/EDF/WAO) and is widely used in UK dermatology and allergy practice.

Fexofenadine compared with other antihistamines

The three most commonly used non-sedating antihistamines in the UK are cetirizine, loratadine, and fexofenadine.

All three are effective for hay fever and urticaria, but they differ in their sedation profiles and pharmacokinetics.

Cetirizine (10 mg once daily) is effective but may cause drowsiness in approximately 10% of users, as it has moderate ability to cross the blood-brain barrier.

Loratadine (10 mg once daily) is less sedating than cetirizine but requires hepatic metabolism via CYP3A4 and CYP2D6 to its active metabolite desloratadine, making it more susceptible to drug interactions.

Fexofenadine is considered the least sedating of the three, with PET studies showing minimal central H1-receptor occupancy.

It undergoes little hepatic metabolism and is less affected by drug interactions involving CYP enzymes.

For patients who have tried cetirizine or loratadine and found them insufficiently effective or too sedating, fexofenadine is an excellent alternative.

For patients whose daily activities require full alertness (such as professional drivers, pilots, or those operating heavy machinery), fexofenadine may be the preferred first-line choice due to its minimal sedation risk.

Dosage and administration

For seasonal allergic rhinitis in adults and adolescents aged 12 and over, take one 120 mg tablet once daily with water.

For chronic idiopathic urticaria in adults and adolescents aged 12 and over, take one 180 mg tablet once daily with water.

Swallow the tablet whole; do not crush or chew it.

Take fexofenadine on an empty stomach, or at least one hour before or two hours after a meal, as food (particularly high-fat meals) can reduce absorption by approximately 30%.

Swallow the tablet with a glass of water only.

Avoid taking it with apple, orange, or grapefruit juice, as these fruit juices inhibit organic anion-transporting polypeptides (OATPs) in the gut, reducing fexofenadine absorption by up to 36%.

Do not take aluminium- or magnesium-containing antacids within two hours of fexofenadine, as they can form chelates that reduce absorption.

If you forget a dose, take it as soon as you remember unless it is nearly time for your next dose. Do not take two doses to make up for a missed one.

Side effects of fexofenadine

Common side effects

The most commonly reported side effects in clinical trials are headache, drowsiness, dizziness, and nausea, though the rates of these events were similar to those observed with placebo.

Fexofenadine is one of the best-tolerated medicines available, and most people experience no significant side effects at recommended doses.

Uncommon and rare side effects

Uncommon effects include fatigue, dry mouth, diarrhoea, and abdominal pain. Rare effects include insomnia, nervousness, tachycardia, and palpitations. Very rare hypersensitivity reactions have been reported, including rash, urticaria, pruritus, angioedema, chest tightness, dyspnoea (breathing difficulty), flushing, and anaphylaxis.

Unlike first-generation antihistamines, fexofenadine does not have significant anticholinergic (drying) effects and is unlikely to cause blurred vision, urinary retention, constipation, or dry mouth at recommended doses.

When to seek urgent medical advice

Stop taking fexofenadine and call 999 or attend A&E immediately if you develop sudden swelling of your face, lips, tongue, or throat, difficulty breathing, or signs of a severe allergic reaction (anaphylaxis).

Contact your GP or call NHS 111 if you experience any persistent or troublesome side effects.

Report any suspected adverse reactions to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Contraindications

Fexofenadine is contraindicated in patients with known hypersensitivity to fexofenadine hydrochloride or any excipient listed in the product information. There are no other absolute contraindications.

Use with caution in patients with severe renal impairment, as elimination may be prolonged; a lower starting dose may be advisable.

Drug and food interactions

Erythromycin and ketoconazole increase fexofenadine plasma levels (by approximately two to three-fold) through inhibition of P-glycoprotein and OATP transporters.

Although no clinically significant increase in adverse effects has been demonstrated at these higher levels, concurrent use warrants awareness.

Aluminium- and magnesium-containing antacids should be separated from fexofenadine by at least two hours. Avoid apple, orange, and grapefruit juice at the time of dosing.

Pregnancy and breastfeeding

There are insufficient human data to confirm the safety of fexofenadine during pregnancy.

Animal studies have not demonstrated teratogenicity, but as a precaution, fexofenadine should be avoided during pregnancy unless considered essential.

Loratadine and cetirizine are generally preferred as first-line antihistamines in pregnant women in UK clinical practice, as more safety data are available.

Fexofenadine is excreted in breast milk in animal studies, and avoidance during breastfeeding is recommended unless the benefit outweighs the risk.

Loratadine is generally the preferred antihistamine during breastfeeding.

Driving and machinery

Fexofenadine at recommended doses does not usually impair the ability to drive or operate machinery. However, individual responses vary.

If you experience any drowsiness or dizziness, do not drive until these effects resolve.

Be aware that untreated allergy symptoms (particularly sleep disruption from nasal congestion) can themselves impair concentration and driving ability.

How to get fexofenadine in the UK

Fexofenadine 120 mg tablets for hay fever are now available to purchase directly from pharmacies in the UK without a prescription for adults aged 18 and over.

Your pharmacist will ask questions about your symptoms and medical history to confirm suitability. For the 180 mg strength (chronic urticaria), a prescription is required.

Your GP can prescribe fexofenadine following a clinical assessment of your symptoms.

Authorised online prescribers registered with the General Pharmaceutical Council (GPhC) can also issue prescriptions after an appropriate consultation.

The NHS prescription charge in England is currently 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Many patients with hay fever may find it more convenient and cost-effective to purchase fexofenadine 120 mg directly from a pharmacy, particularly if they are not exempt from prescription charges.

Living with allergies: practical advice alongside fexofenadine

Antihistamines are most effective when used as part of a broader allergy management strategy.

For hay fever, practical measures include monitoring pollen forecasts (available on the Met Office website and BBC Weather), keeping windows closed during high pollen days, showering and changing clothes after spending time outdoors, wearing wraparound sunglasses to protect your eyes, and drying clothes indoors rather than on an outside line during pollen season.

Nasal saline irrigation can help wash pollen from the nasal passages.

If symptoms are not adequately controlled with fexofenadine alone, your GP may recommend adding an intranasal corticosteroid spray (such as fluticasone or mometasone) for more comprehensive relief.

For chronic urticaria, keeping a symptom diary can help identify potential triggers, though in many cases no specific trigger is found.

Avoiding tight clothing, excessive heat, and known skin irritants may help reduce flare-ups.

If standard-dose fexofenadine is insufficient, your GP or dermatologist may increase the dose (up to 180 mg four times daily) before considering specialist referral for second-line treatments.

Sources

• Fexofenadine 120 mg Film-Coated Tablets, Summary of Product Characteristics (EMC)
• Fexofenadine hydrochloride, British National Formulary (BNF)
• NICE CKS: Allergic rhinitis
• NICE CKS: Urticaria
• Antihistamines, NHS
• MHRA Yellow Card Scheme