What's the best allergy medication? The answer depends on your specific symptoms, triggers, and health history — but understanding your options is the first step to effective relief. In the UK, a range of treatments is available, from over-the-counter antihistamines and intranasal corticosteroid sprays to prescription-only options and specialist immunotherapy. Whether you're managing hay fever, allergic rhinitis, urticaria, or allergic conjunctivitis, this guide covers what the NHS and NICE recommend, how common treatments compare, and when to seek professional medical advice.

Common Types of Allergy Medication Available in the UK

UK allergy medications include antihistamines, intranasal corticosteroids, antiallergic eye drops, decongestants, and immunotherapy; many are available over the counter, while others require a prescription.

Allergy medications in the UK fall into several broad categories, each targeting different aspects of the allergic response. The most widely used include antihistamines, intranasal corticosteroid sprays, eye drops, decongestants, and, in more severe cases, immunotherapy. Many of these are available over the counter at pharmacies, whilst others require a prescription from a GP.

Antihistamines are typically the first-line treatment for mild to moderate allergic symptoms such as sneezing, itching, and a runny nose. They work by blocking histamine H1 receptors, thereby reducing the inflammatory response triggered by allergen exposure. In the UK, commonly available antihistamines include:

• Non-drowsy (second-generation): cetirizine, loratadine, fexofenadine (note: fexofenadine 120 mg is available as a pharmacy medicine for hay fever; fexofenadine 180 mg for urticaria is generally prescription-only)

• Sedating (first-generation): chlorphenamine (e.g., Piriton)

Intranasal corticosteroid sprays are often the most effective single treatment for nasal-predominant allergic rhinitis. Several are now available without prescription for adults, including beclometasone (e.g., Beconase), fluticasone propionate (e.g., Flixonase), mometasone, and triamcinolone. Age restrictions vary by product — always check the label. Antiallergic eye drops, including sodium cromoglicate, help manage allergic conjunctivitis.

Decongestants (for example, topical xylometazoline or oxymetazoline nasal sprays, or oral pseudoephedrine) can relieve nasal congestion but should be used with caution. Topical decongestant nasal sprays should not be used for more than 3–7 days, as prolonged use can cause rebound congestion (rhinitis medicamentosa). Oral and topical decongestants should be avoided — or used only on medical advice — by people with high blood pressure, heart disease, glaucoma, an enlarged prostate, or hyperthyroidism, and must not be taken alongside monoamine oxidase inhibitors (MAOIs). They are not recommended during pregnancy.

For those with persistent or severe allergic rhinitis confirmed to be IgE-mediated and inadequately controlled by maximal medical therapy, a GP may refer patients for allergen immunotherapy (see below). Understanding which category best suits your symptoms is the essential first step in finding effective relief.

How Antihistamines, Nasal Sprays and Eye Drops Compare

Intranasal corticosteroids outperform oral antihistamines for nasal symptoms, antihistamines provide broad multi-symptom relief, and antiallergic eye drops are specifically indicated for allergic conjunctivitis.

Choosing between antihistamines, nasal sprays, and eye drops depends largely on the nature and location of your symptoms. Each treatment has a distinct mechanism of action and a different evidence base supporting its use.

Antihistamines act systemically, making them useful when symptoms affect multiple areas — for example, sneezing, skin itching, and watery eyes simultaneously. Non-drowsy antihistamines such as cetirizine and loratadine are generally preferred for daytime use, as they carry a lower risk of sedation. Chlorphenamine may be appropriate at night when its sedating effect is less problematic, but it can cause next-day drowsiness and anticholinergic effects (such as dry mouth and urinary retention), particularly in older adults.

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Intranasal corticosteroid sprays are considered more effective than oral antihistamines for nasal symptoms alone, in line with NICE Clinical Knowledge Summaries (CKS) guidance on allergic rhinitis. They reduce nasal congestion, discharge, and sneezing by suppressing local inflammation in the nasal mucosa. They typically take several days of regular use to reach full effect and are best started before the allergy season begins. Common side effects include nasal irritation and occasional minor nosebleeds; these are usually mild and can be reduced by correct technique.

Eye drops are specifically indicated for allergic conjunctivitis. Sodium cromoglicate drops are available over the counter and offer targeted relief for redness, itching, and watering of the eyes; they require regular use (often four times daily) and may take a few days to reach full effect. Olopatadine eye drops are generally prescription-only in the UK. Antazoline/vasoconstrictor combination drops are available over the counter but should only be used short-term. Eye drops are often used alongside an antihistamine or nasal spray rather than as a standalone treatment.

In summary:

• Antihistamines — broad symptom relief, fast-acting

• Nasal sprays — superior for nasal congestion, best used regularly

• Eye drops — targeted relief for ocular symptoms

For people with symptoms that persist despite standard treatments, prescription options such as intranasal antihistamines or a combined intranasal corticosteroid/antihistamine spray may be considered by a GP.

For many people, a combination approach provides the most comprehensive symptom control.

Choosing the Right Treatment for Your Allergy Symptoms

Treatment choice should be guided by dominant symptoms: antihistamines for sneezing and itching, nasal corticosteroid sprays for congestion, and eye drops for ocular symptoms; pregnancy, age, and comorbidities must also be considered.

There is no single 'best' allergy medication that suits everyone — the most appropriate choice depends on your specific symptoms, their severity, your lifestyle, and any other medical conditions or medications you take. A pharmacist can offer valuable guidance without the need for a GP appointment in many straightforward cases.

If your primary symptoms are sneezing, itching, and a runny nose, a non-drowsy antihistamine taken daily during your trigger season is a reasonable starting point. If nasal congestion is prominent, adding an intranasal corticosteroid spray is likely to provide better relief. For those who experience itchy, watery eyes as a dominant symptom, antiallergic eye drops should be considered alongside oral treatment. If standard non-drowsy antihistamines (cetirizine or loratadine) are insufficient for hay fever, pharmacist-supplied fexofenadine 120 mg is an option worth discussing.

It is also worth considering timing and lifestyle factors:

• If you drive or operate machinery, avoid sedating antihistamines; be aware that even some non-sedating antihistamines can impair performance in certain individuals

• If you are pregnant or breastfeeding, always consult a pharmacist or GP before starting any allergy medication; cetirizine or loratadine are generally considered the preferred antihistamines in pregnancy, but professional advice is essential. Decongestants should be avoided during pregnancy unless specifically advised by a clinician

• Children may require age-appropriate formulations and doses — always check the product labelling and seek pharmacist advice if unsure

• Those with asthma should be aware that poorly controlled allergic rhinitis can worsen asthma symptoms; effective allergy treatment is particularly important, and it is advisable to ensure your asthma action plan is up to date

Keeping a symptom diary can help identify patterns and triggers, enabling more targeted treatment choices. If over-the-counter options fail to provide adequate relief after two to four weeks of consistent use, it is advisable to seek further medical assessment.

If you experience any suspected side effects from allergy medication, you can report these via the MHRA Yellow Card Scheme (yellowcard.mhra.gov.uk).

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What the NHS and NICE Recommend for Allergy Relief

NICE CKS recommends a stepwise approach starting with a non-sedating antihistamine and/or intranasal corticosteroid, escalating to combination therapy or specialist referral for immunotherapy if symptoms persist.

NICE Clinical Knowledge Summaries (CKS) and NHS guidance provide a clear framework for the management of common allergic conditions, particularly allergic rhinitis and urticaria (hives). The BSACI (British Society for Allergy and Clinical Immunology) and the ARIA (Allergic Rhinitis and its Impact on Asthma) guideline provide supporting specialist guidance.

1. For allergic rhinitis, NICE CKS recommends a stepwise approach:
2. First-line: A non-sedating oral antihistamine and/or an intranasal corticosteroid spray
3. If inadequate response: Combination therapy with both an antihistamine and a nasal corticosteroid spray
4. Persistent or severe symptoms: Referral to a specialist for consideration of allergen immunotherapy

NICE CKS highlights that intranasal corticosteroids are the most effective single treatment for allergic rhinitis, particularly when nasal symptoms predominate. The MHRA has approved several intranasal corticosteroids for over-the-counter sale in adults, reflecting their established safety profile when used as directed.

For allergic conjunctivitis, NHS guidance recommends topical antihistamine eye drops or sodium cromoglicate as first-line options. For urticaria, non-sedating antihistamines are the recommended first-line treatment. In chronic urticaria, doses higher than standard may sometimes be used, but this is an off-label approach and should only be undertaken under the supervision of a GP or specialist.

NICE CKS does not recommend routine allergy testing in primary care for most patients with mild to moderate symptoms, as clinical history and response to treatment are usually sufficient to guide management. Formal allergy testing is generally reserved for cases where the diagnosis is uncertain, symptoms are severe, or immunotherapy is being considered.

Allergen immunotherapy (delivered as subcutaneous injections [SCIT] or sublingual tablets/drops [SLIT]) is a specialist treatment for confirmed IgE-mediated allergic rhinitis that has not responded adequately to maximal medical therapy. It is not suitable for people with uncontrolled asthma. Referral is via a GP to an NHS allergy clinic.

When to Seek Medical Advice or a Prescription

See a GP if over-the-counter treatments fail after two to four weeks, symptoms are severe, or asthma is worsening; call 999 immediately for signs of anaphylaxis such as throat swelling or breathing difficulty.

Whilst many allergy symptoms can be effectively managed with over-the-counter treatments, there are important situations where professional medical advice should be sought promptly.

Contact your GP if:

• Symptoms are severe, persistent, or significantly affecting your quality of life or sleep

• Over-the-counter treatments have not provided adequate relief after two to four weeks

• You experience frequent or worsening asthma symptoms alongside your allergies

• You develop side effects from allergy medication

• You are unsure whether your symptoms are due to allergy or another condition

• You are pregnant, breastfeeding, or managing a long-term health condition

Seek emergency medical attention immediately if you experience signs of a severe allergic reaction (anaphylaxis), including:

• Swelling of the throat, lips, or tongue

• Difficulty breathing or swallowing

• A sudden drop in blood pressure, dizziness, or loss of consciousness

• Widespread rash combined with any of the above

Anaphylaxis is a medical emergency — call 999 immediately and say 'anaphylaxis'. Individuals known to be at risk of anaphylaxis should carry two adrenaline auto-injectors (such as an EpiPen or Jext) at all times. Use the first auto-injector immediately at the onset of anaphylaxis symptoms. If there is no improvement after approximately five minutes, use the second auto-injector whilst waiting for emergency services. The person should lie flat with their legs raised (unless breathing is difficult, in which case they may sit up); do not allow them to stand up suddenly. An agreed written emergency action plan should be in place with your GP or allergy specialist.

For those with moderate to severe or difficult-to-control allergies, a GP may prescribe prescription-only options — such as fexofenadine 180 mg for urticaria, higher-dose nasal corticosteroids, or intranasal antihistamines — or refer to an NHS allergy clinic for specialist assessment and possible immunotherapy.

Suspected side effects from any allergy medication can be reported via the MHRA Yellow Card Scheme (yellowcard.mhra.gov.uk).

Practical Tips for Managing Allergies Alongside Medication

Combining medication with allergen avoidance — such as allergen-proof bedding covers, saline nasal irrigation, and monitoring pollen counts — improves symptom control and may reduce medication requirements.

Medication alone is rarely the complete answer to allergy management. Combining pharmacological treatment with practical avoidance strategies and lifestyle adjustments can significantly reduce symptom burden and, in some cases, reduce the amount of medication needed.

For hay fever and pollen allergy:

• Monitor daily pollen counts via the Met Office or NHS website and limit outdoor activity on high-pollen days

• Shower and change clothes after spending time outdoors

• Keep windows closed during peak pollen times (typically early morning and early evening)

• Avoid drying clothes outdoors on high-pollen days

• Wear wraparound sunglasses to protect eyes from airborne pollen

• Apply a small amount of petroleum jelly around the nostrils to help trap pollen before it enters the nasal passages

• Saline nasal irrigation (using a saline rinse or spray) is a safe and effective adjunct that can help clear allergens and mucus from the nasal passages

For house dust mite allergy:

• Use allergen-proof mattress and pillow covers — prioritising the bedroom is most important, as this is where exposure is greatest

• Wash bedding weekly at 60°C

• Vacuum regularly using a HEPA-filter vacuum cleaner

• Reduce soft furnishings and carpets where possible

• Note that environmental control measures alone may provide only modest benefit; they are most effective as part of an overall management plan

For pet allergy:

• Keep pets out of bedrooms and off soft furnishings

• Wash hands after contact with animals

• Ensure good ventilation in the home

Finally, adherence to medication is key — many treatments, particularly nasal sprays, work best when used consistently rather than only when symptoms flare. If you are unsure how to use a nasal spray correctly, ask your pharmacist for a demonstration, as poor technique is a common reason for inadequate symptom control. Regular review with a healthcare professional ensures your management plan remains appropriate as your symptoms evolve.

Frequently Asked Questions