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Overview

Hayfever isn’t just about sneezing — it can leave you drained, unfocused, and dreading the outdoors. From itchy, watery eyes to a blocked nose that keeps you up at night, the symptoms can feel relentless. Fexofenadine is a modern, non-drowsy antihistamine designed to give you fast, all-day relief from the full range of hayfever symptoms.

Working within an hour, it helps calm sneezing, clear congestion, and soothe irritation — all without making you feel sluggish or tired. That means you can stay sharp at work, enjoy time outdoors, and get back to living life on your terms. Whether you’re managing mild flare-ups or battling more persistent symptoms, Fexofenadine provides trusted, reliable relief when you need it most.

This medicine requires a secure online consultation with a UK-registered prescriber, and will only be supplied if clinically appropriate.

 

What is Fexofenadine


Fexofenadine is a modern antihistamine used to treat hayfever (seasonal allergic rhinitis). It works by blocking histamine, the chemical released during allergic reactions that causes inflammation, itching, and excess mucus.

Fast-acting relief within 1 hour


Lasts all day with a single dose


Non-drowsy formula — ideal for work, driving, or studying


Widely prescribed as a first-line treatment for moderate to severe hayfever


Fexofenadine is the generic form of Telfast, offering the same active ingredient and clinical effectiveness at a lower cost.

Directions

  • Standard adult dose: 120mg once daily for hayfever or 180mg if other strengths have proved ineffective
  • Take the tablet with water before a meal.
  • Aim to take it at the same time each day.
  • Do not exceed the prescribed dose.
  • Always follow your prescriber’s instructions.

Side Effects

Like all prescription medicines, this treatment can cause side effects, although not everyone will experience them. Most are mild, temporary, and improve as your body adjusts, but it’s important to be aware of them.

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

  • Headache – this is one of the most frequently reported side effects. It is usually mild to moderate and can often be managed by keeping well hydrated, resting, or using simple pain relief if appropriate.
  • Drowsiness (rare, but possible) – some people may feel unusually tired or sleepy. If this happens, avoid driving or operating machinery until you know how the medicine affects you.
  • Dizziness – you may occasionally feel light-headed, especially when standing up suddenly. Staying hydrated and rising slowly from a seated or lying position can help reduce this effect.
  • Nausea – a small number of people may feel sick after taking the medicine. Taking it with food or a light snack can sometimes help reduce nausea.


Uncommon (may affect up to 1 in 1000 people):

  • Insomnia – difficulty sleeping can occur in some patients. Good sleep habits, such as avoiding caffeine in the evening and keeping a regular bedtime routine, may help.
  • Nervousness – some individuals report feeling restless, anxious, or jittery. If this persists, it’s best to speak with your prescriber.
  • Dry mouth – this may be bothersome but is usually temporary. Sipping water regularly, chewing sugar-free gum, or using saliva substitutes can help relieve dryness.


Rare (seek medical advice if severe):

  • Allergic reaction – symptoms may include skin rash, itching, swelling (particularly of the face, lips, or throat), or difficulty breathing. This requires immediate medical attention. Stop taking the medicine and seek urgent help if you experience these symptoms.

Most people tolerate this treatment well, and side effects—if they occur—tend to be short-lived. If any side effect becomes bothersome, or you are worried about your symptoms, consult your doctor, pharmacist, or prescriber.


Disclaimer: This is not a complete list of side effects. For the full information, always read the patient information leaflet provided with your medicine. If you are concerned about side effects, seek medical advice. In an emergency, seek immediate medical assistance.

Warnings

Fexofenadine may not be suitable if you:

  • Are allergic to fexofenadine or any ingredients in the tablets
  • Have kidney or liver problems
  • Are pregnant or breastfeeding (only use if approved by your doctor)
  • Are taking other medicines such as erythromycin or ketoconazole (which can interact with fexofenadine)

FAQ's

Is Fexofenadine as effective as Telfast?
Yes — it contains the same active ingredient, dose, and clinical effectiveness. The main difference is branding and price.

How soon will I notice relief?
Most people feel relief within 1 hour, and effects last for 24 hours.

Will it make me drowsy?
It’s classed as a non-drowsy antihistamine, but a small number of people may still feel mild tiredness.

Can I take Fexofenadine long-term?
Yes, many people take it daily throughout hayfever season under medical supervision.

Can children take Fexofenadine?
Different strengths may be prescribed for children — always follow your prescriber’s advice.

What if antihistamines don’t fully control my symptoms?
Sometimes combining treatments (e.g. with a steroid nasal spray) works best. Speak to a prescriber for tailored advice.