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Telfast

Telfast

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  • ✔️ Relieves hay fever sneezing, itching, and runny nose
  • ✔️ Non-drowsy formula — stay alert throughout the day
  • ✔️ Starts working within one to three hours of dosing
  • ✔️ Once-daily 120mg tablet for all-day allergy control
  • ✔️ Suitable for adults and adolescents aged 12 and over

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What Are Telfast Hay Fever Tablets?

 

If hay fever is making your days miserable — constant sneezing, itchy eyes, a nose that won't stop running — you're far from alone. Hay fever affects around one in five people in the UK, and for many, it's a seasonal battle that starts as early as March and runs well into September. Telfast hay fever tablets offer a clinically proven, non-drowsy way to manage those symptoms so you can get on with your day. Available from our allergy and hay fever range, Telfast is one of the most widely recognised antihistamine brands in the UK.

Telfast contains fexofenadine hydrochloride as its active ingredient. It belongs to a class of medicines called second-generation antihistamines, which are specifically designed to relieve allergy symptoms without the sedating effects associated with older antihistamines. Each tablet contains 120mg of fexofenadine hydrochloride and is taken once daily by adults and children aged 12 and over.

 

How Does Telfast Work to Relieve Allergy Symptoms?

 

When your body encounters an allergen — pollen, dust mites, pet dander — it releases a chemical called histamine. Histamine binds to receptors throughout your body and triggers the familiar cascade of allergy symptoms. Telfast works by blocking those receptors before histamine can cause a reaction.

  • Fexofenadine selectively blocks peripheral H1 histamine receptors
  • It does not readily cross the blood-brain barrier, which is why it causes minimal sedation
  • Symptom relief typically begins within one to three hours of taking a dose
  • A single tablet provides up to 24 hours of continuous relief

Because fexofenadine doesn't significantly affect the central nervous system, most people can take Telfast and continue their normal activities — including driving — without feeling groggy or impaired.

 

Who Is Telfast Suitable For?

 

Telfast is suitable for a wide range of people dealing with seasonal or perennial allergic rhinitis. It's particularly useful if you've found older antihistamines too sedating, or if you need to stay alert at work or while driving. That said, it isn't right for everyone.

  • Adults and adolescents aged 12 years and over
  • People with seasonal hay fever (allergic rhinitis)
  • Those experiencing chronic idiopathic urticaria (hives with no identified cause)
  • Individuals who need a non-drowsy option for daytime allergy management

Telfast is not recommended for children under 12, and it should be used with caution in people with kidney problems, as fexofenadine is primarily excreted via the kidneys. If you're unsure whether it's right for you, speak to your pharmacist before purchasing.

 

How Does Telfast Compare to Other Antihistamines?

 

Feature Telfast (Fexofenadine 120mg) Cetirizine 10mg
Active ingredient Fexofenadine hydrochloride Cetirizine hydrochloride
Drowsiness risk Very low Low to moderate in some people
Dosing frequency Once daily Once daily
Suitable age 12 years and over 6 years and over (varies by formulation)

 

How Should You Store Telfast and Is It Suitable Long-Term?

 

Store Telfast tablets below 25°C in a dry place, away from direct sunlight. Keep them out of reach and sight of children. Do not use the tablets after the expiry date printed on the pack. If you're managing ongoing allergic symptoms throughout the hay fever season, Telfast hay fever tablets can be used daily for the duration of your exposure to allergens — but it's worth reviewing your treatment with a pharmacist if symptoms persist beyond the expected season or worsen over time.

For those dealing with eye-related allergy symptoms alongside nasal symptoms, you might also want to explore our eye care range for complementary relief options.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Telfast specifications
Treatment category Allergic rhinitis (hay fever), chronic idiopathic urticaria
Mechanism of action Selective peripheral H1 histamine receptor antagonist
Effective Within 1–3 hours; lasts up to 24 hours
Suitable for Adults and children aged 12 years and over
Active ingredient Fexofenadine hydrochloride
Pack sizes 30 tablets
Strengths 120mg
UK classification P (Pharmacy medicine)
Drug class Second-generation antihistamine
Preparation Film-coated tablet
Route of administration Oral

Specifications of Telfast

 

What Is Telfast and What Is It Used For?

 

Telfast is a non-drowsy antihistamine tablet used to relieve the symptoms of seasonal allergic rhinitis — commonly known as hay fever — and chronic idiopathic urticaria (persistent hives without a known cause). Its active ingredient, fexofenadine hydrochloride 120mg, works by blocking histamine receptors in the body, reducing the sneezing, itching, runny nose, and watery eyes that make hay fever so disruptive. It is licensed for use in adults and adolescents aged 12 years and over in the UK.

 

What Do You Need to Know Before Using Telfast?

 

Before taking Telfast, it's important to check whether it's appropriate for you. There are certain situations where you should not take it, and others where extra care is needed.

Do not take Telfast if you:

  • Are allergic to fexofenadine hydrochloride or any other ingredient in the tablet
  • Are under 12 years of age
  • Are pregnant or breastfeeding, unless specifically advised by your doctor

Take care and speak to your pharmacist or doctor if you:

  • Have kidney problems — fexofenadine is renally excreted and dose adjustment may be needed
  • Have heart problems, as high doses of fexofenadine have been associated with QT prolongation in some studies
  • Are elderly, as you may be more sensitive to the effects of antihistamines

Known drug interactions:

  • Antacids containing aluminium or magnesium hydroxide — take Telfast at least 2 hours before or after these
  • Erythromycin and ketoconazole — may increase fexofenadine plasma levels
  • Fruit juices (grapefruit, orange, apple) — can significantly reduce absorption; take with water only

 

How Should You Use Telfast?

 

Always take Telfast exactly as described in the patient information leaflet or as directed by your pharmacist. Taking it correctly ensures you get the full benefit of the medicine.

  1. Take one tablet once daily, at approximately the same time each day
  2. Swallow the tablet whole with a full glass of water — do not crush or chew
  3. Do not take with fruit juice; water is the only recommended drink
  4. If you are also taking an antacid, leave a gap of at least 2 hours between the two medicines
  5. If you miss a dose, take it as soon as you remember — but skip it if your next dose is due soon. Never double up.
Indication Age Group Dose Frequency
Seasonal allergic rhinitis (hay fever) Adults and children 12+ 120mg (1 tablet) Once daily
Chronic idiopathic urticaria Adults and children 12+ 120mg (1 tablet) Once daily
Renal impairment Adults As directed by doctor As directed

 

What Are the Possible Side Effects of Telfast?

 

Like all medicines, Telfast can cause side effects, although not everyone experiences them. Most side effects are mild and resolve on their own. If you experience anything severe or unexpected, stop taking the tablets and seek medical advice promptly.

Common side effects (may affect up to 1 in 10 people):

  • Headache
  • Drowsiness (despite its non-drowsy classification, a small number of people are affected)
  • Nausea
  • Dizziness

Less common side effects (may affect up to 1 in 100 people):

  • Fatigue or tiredness
  • Dry mouth
  • Insomnia
  • Nervousness
  • Abdominal pain or diarrhoea

Serious allergic reactions to fexofenadine are rare but possible. Seek emergency medical help immediately if you develop swelling of the face, lips, tongue or throat, difficulty breathing, or a severe skin rash. If you're managing other allergy-related conditions alongside hay fever, our ear, nose and throat range may offer additional support for nasal and sinus symptoms.

 

How Should You Store Telfast?

 

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the carton
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Telfast hay fever tablets online in the UK?

You can buy Telfast hay fever tablets directly from Cured Pharmacy, a GPhC-registered online pharmacy. Simply browse our allergy and hay fever collection, add Telfast to your basket, and complete a brief health check at checkout. Orders are dispatched promptly with discreet packaging.

How does Telfast work in the body?

Telfast contains fexofenadine hydrochloride, which selectively blocks peripheral H1 histamine receptors. When your body encounters an allergen like pollen, it releases histamine — fexofenadine prevents histamine from binding to those receptors and triggering symptoms. Because it doesn't readily cross the blood-brain barrier, it causes far less sedation than older antihistamines.

How long does Telfast take to start working?

Most people notice symptom relief within one to three hours of taking a Telfast tablet. The effects typically last for up to 24 hours, which is why it's taken just once a day. For best results during high pollen days, take it in the morning before you head outside.

What is the correct dose of Telfast 120mg for adults?

The recommended dose for adults and adolescents aged 12 and over is one 120mg tablet taken once daily. Always swallow the tablet whole with a full glass of water — not fruit juice. Do not take more than one tablet in a 24-hour period unless specifically directed by a doctor.

What is the best time of day to take Telfast?

There is no strict requirement on timing, but taking Telfast in the morning is generally recommended so that it provides coverage throughout the day when pollen counts are typically highest. Taking it at the same time each day also helps you remember your dose consistently. Avoid taking it with breakfast if you're having fruit juice — stick to water.

Can Telfast cause drowsiness?

Telfast is classified as a non-drowsy antihistamine and is much less likely to cause sedation than first-generation antihistamines like chlorphenamine. However, a small number of people may still experience mild drowsiness, particularly when first starting treatment. If you notice any drowsiness, avoid driving or operating heavy machinery until you know how the medicine affects you.

Is Telfast safe to take during pregnancy or breastfeeding?

Telfast is not recommended during pregnancy or breastfeeding unless a doctor has specifically advised it, as there is limited clinical data on its safety in these situations. If you are pregnant, planning to become pregnant, or breastfeeding, speak to your GP before taking any antihistamine. Your doctor can advise on the safest option for managing your allergy symptoms.

Can I take Telfast with other medicines?

Telfast can interact with certain medicines, including antacids containing aluminium or magnesium hydroxide — leave at least a two-hour gap between these and your Telfast dose. Erythromycin and ketoconazole may increase fexofenadine levels in the blood. Always tell your pharmacist about all medicines, supplements, and herbal remedies you are taking before starting Telfast.

What happens if I miss a dose of Telfast?

If you miss a dose, take it as soon as you remember — unless it's nearly time for your next scheduled dose, in which case simply skip the missed one. Never take two tablets at once to make up for a missed dose. Missing an occasional dose is unlikely to cause any harm, but consistent daily use gives the best symptom control.

Who is not eligible to take Telfast?

Telfast is not suitable for children under 12 years of age, people with a known allergy to fexofenadine or any tablet ingredient, or those with severe kidney impairment without medical supervision. Pregnant and breastfeeding women should seek medical advice before use. If you have heart problems or are taking medicines that affect heart rhythm, consult your doctor first.

How long can you take Telfast for?

Telfast can be taken throughout the hay fever season, which in the UK typically runs from late March to September depending on the pollen type you're allergic to. For chronic idiopathic urticaria, it may be used for longer periods under medical guidance. If your symptoms persist beyond the expected season or don't improve after a few weeks, speak to your GP.

What are the alternatives to Telfast for hay fever?

Common alternatives include cetirizine (Zirtek), loratadine (Clarityn), and acrivastine (Benadryl Allergy Relief) — all available without prescription. Nasal corticosteroid sprays such as fluticasone are also highly effective for nasal symptoms. You can explore a range of options in our allergy and hay fever collection to find what suits you best.

Can I drink alcohol while taking Telfast?

Telfast is not known to interact significantly with alcohol, but drinking alcohol alongside any antihistamine may increase the risk of drowsiness or dizziness. It's sensible to be cautious, particularly if you're driving or operating machinery. If you're unsure, speak to your pharmacist for personalised advice.

Can Telfast be used for skin allergies or hives?

Yes — Telfast 120mg is licensed for the treatment of chronic idiopathic urticaria (persistent hives with no identified cause) in adults and children aged 12 and over. It helps reduce the itching, redness, and raised welts associated with hives by blocking histamine receptors in the skin. If your hives are severe, recurrent, or accompanied by other symptoms, see your GP for a full assessment.

What are the latest findings on fexofenadine for hay fever?

Fexofenadine remains one of the most studied second-generation antihistamines, with a well-established safety and efficacy profile supported by decades of clinical use. Current NHS guidance continues to recommend non-drowsy antihistamines like fexofenadine as a first-line treatment for hay fever. Research consistently confirms its low sedation risk compared to first-generation alternatives, making it a reliable choice for daytime allergy management.

How Should You Use Telfast?

Telfast tablets are straightforward to take, but following the correct method ensures you get the most from each dose. Always read the patient information leaflet supplied with your pack before starting treatment, and check with your pharmacist if you have any questions.

What Is the Correct Dose of Telfast?

The dose of Telfast depends on your age and the condition being treated. The table below summarises the standard dosing guidance. Do not exceed the stated dose without medical advice, and always consult your pharmacist if you are unsure.

When Is the Best Time to Use Telfast?

Taking Telfast in the morning is generally the most practical approach, as pollen counts in the UK tend to peak during the morning and early afternoon. Morning dosing also means the medicine is active throughout the day when you're most likely to be outdoors and exposed to allergens. That said, the most important thing is consistency — pick a time that fits your routine and stick to it each day.

If you find that your symptoms are worse at night — for example, if you're reacting to indoor allergens like dust mites — an evening dose may suit you better. Discuss this with your pharmacist if you're unsure which timing works best for your specific triggers.

How Long Can You Use Telfast For?

Telfast can be used throughout the hay fever season, which in the UK typically spans from late March through to September, depending on which pollens trigger your symptoms. Grass pollen season usually peaks between May and July, while tree pollen starts earlier in spring. You can take Telfast daily for the duration of your exposure to the relevant allergen.

For chronic idiopathic urticaria, Telfast may be used for longer periods under the guidance of a doctor or dermatologist. If your symptoms don't improve after a few weeks of regular use, or if they worsen, seek medical advice rather than continuing indefinitely without review.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Side Effects of Telfast?

Telfast is generally well tolerated, and most people experience no side effects at all. However, as with any medicine, some people may notice unwanted effects, particularly when first starting treatment. Common side effects are usually mild and tend to resolve without any specific treatment.

  • Headache
  • Nausea
  • Dizziness
  • Drowsiness (in a small number of people, despite its non-drowsy classification)

What Are the Less Common Side Effects of Telfast?

Less common side effects occur in fewer than one in a hundred people. They are generally not serious, but if any of these bother you or persist, it's worth speaking to your pharmacist or GP for advice.

  • Fatigue or unusual tiredness
  • Dry mouth
  • Insomnia or difficulty sleeping
  • Nervousness or restlessness
  • Abdominal pain
  • Diarrhoea
  • Back pain

What Are the Serious Side Effects of Telfast?

Serious side effects from Telfast are rare but can occur. A severe allergic reaction (anaphylaxis) to fexofenadine is uncommon but requires immediate medical attention. Signs of a serious allergic reaction include swelling of the face, lips, tongue, or throat, difficulty breathing or swallowing, a rapid or irregular heartbeat, and a severe skin rash or widespread hives.

There have also been rare reports of chest tightness and palpitations associated with fexofenadine use. If you experience any of these symptoms, stop taking Telfast immediately and call 999 or go to your nearest A&E department.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as headache or nausea, these often improve after the first few days as your body adjusts to the medicine. Staying well hydrated and taking the tablet with food (though not fruit juice) may help reduce nausea. If drowsiness occurs, avoid driving or operating machinery until you know how Telfast affects you personally.

For any side effect that is severe, persistent, or concerns you, contact your pharmacist or GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Telfast Interact With Other Medicines?

Yes — Telfast has a small number of known interactions that are worth being aware of. Antacids containing aluminium or magnesium hydroxide can reduce the absorption of fexofenadine by up to 41%, so always leave a gap of at least two hours between these medicines. Erythromycin (an antibiotic) and ketoconazole (an antifungal) can increase fexofenadine blood levels, which may heighten the risk of side effects.

Fruit juices — particularly grapefruit, orange, and apple — can also significantly reduce how much fexofenadine your body absorbs. Always take Telfast with plain water. If you are taking any prescription medicines, herbal remedies, or supplements, speak to your pharmacist before starting Telfast to check for potential interactions.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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