The best allergy medication for seasonal allergies depends on your specific symptoms, their severity, and your individual health circumstances. Seasonal allergic rhinitis — commonly known as hay fever — affects around 1 in 5 people in the UK, causing sneezing, nasal congestion, itchy eyes, and a runny nose. From non-sedating antihistamines to intranasal corticosteroid sprays, several effective options are available over the counter or on prescription. This guide explains how each treatment works, what NHS and NICE recommend, and how to choose the right approach for your symptoms.

Understanding Seasonal Allergies and Their Common Triggers in the UK

Seasonal allergic rhinitis — commonly known as hay fever — affects approximately 1 in 5 people in the UK at some point in their lives (NHS). It is caused by an immune system overreaction to airborne allergens that appear at predictable times of year. When the body encounters these substances, it releases histamine and other inflammatory mediators, triggering the familiar cluster of symptoms: sneezing, nasal congestion, itchy or watery eyes, and an itchy throat or palate.

It is worth distinguishing seasonal allergic rhinitis from perennial allergic rhinitis, which occurs year-round and is typically driven by indoor allergens such as house dust mite, pet dander, or mould. Some people experience both forms. This article focuses primarily on seasonal triggers, but many of the treatments discussed apply to both.

In the UK, the most common seasonal triggers include:

• Tree pollen (birch, oak, ash) — typically peaking between March and May

• Grass pollen — the most prevalent trigger, peaking from May to July

• Weed pollen (nettle, mugwort) — often present from June through to September

• Fungal spores (e.g., Alternaria, Cladosporium) — more prominent in late summer and autumn; these are more strongly associated with asthma exacerbations than with rhinitis alone, and their role in respiratory symptoms should be considered accordingly

The UK's temperate climate means pollen seasons can vary considerably from year to year depending on temperature and rainfall. Warmer springs tend to bring earlier and more intense pollen seasons. The Met Office and NHS provide daily pollen forecasts, which can help individuals plan outdoor activities and time their medication appropriately. Understanding your specific trigger is an important first step, as it allows you to anticipate symptom onset and begin treatment proactively rather than reactively.

Types of Allergy Medication Available for Seasonal Symptoms

A range of medication classes is available for managing seasonal allergies, each targeting different aspects of the allergic response. Choosing the right type — or combination — depends on the nature and severity of your symptoms.

Oral antihistamines are the most widely used first-line treatment. They work by blocking H1 histamine receptors, thereby reducing sneezing, itching, and runny nose. Second-generation antihistamines (e.g., cetirizine, loratadine, fexofenadine) are generally preferred over first-generation options (e.g., chlorphenamine) because they cause significantly less sedation. They are available as tablets and liquids.

Intranasal antihistamines (e.g., azelastine nasal spray) act locally in the nasal passages and can provide rapid relief of nasal symptoms. They are a useful option when oral antihistamines alone are insufficient or when fast-acting nasal relief is needed.

Intranasal corticosteroid sprays (e.g., beclometasone dipropionate, fluticasone propionate, mometasone furoate) are considered highly effective for nasal symptoms, particularly congestion. They work by reducing local inflammation in the nasal mucosa and typically require consistent daily use to achieve full benefit — often taking several days to reach peak effect. All three are available without prescription as pharmacy medicines for adults (age restrictions apply; check individual product labelling).

Combination intranasal sprays containing both azelastine and fluticasone propionate are available on prescription and are effective for moderate-to-severe or refractory nasal symptoms, offering both rapid antihistamine action and sustained anti-inflammatory benefit.

Antihistamine eye drops (e.g., azelastine eye drops, sodium cromoglicate eye drops) are useful for ocular symptoms such as itching and redness. Azelastine eye drops are available over the counter; olopatadine eye drops are prescription-only in the UK.

Decongestants (e.g., pseudoephedrine orally; xylometazoline as a nasal spray) can relieve nasal congestion but are not recommended for long-term use. Topical nasal decongestants should not be used for more than 7 days due to the risk of rebound congestion (rhinitis medicamentosa). Decongestants should be avoided in people with hypertension, cardiovascular disease, hyperthyroidism, glaucoma, or prostatic hypertrophy, and must not be used alongside monoamine oxidase inhibitors (MAOIs). Oral pseudoephedrine carries particular cardiovascular risks and should be used with caution.

Ipratropium bromide nasal spray is a prescription-only option for people whose predominant symptom is troublesome watery rhinorrhoea that has not responded adequately to other treatments.

Sodium cromoglicate eye drops and nasal sprays act as mast cell stabilisers and may be used preventatively. They are generally considered less potent than corticosteroids or antihistamines but are a gentle option suitable for children and those who prefer a preservative-free formulation.

Montelukast (a leukotriene receptor antagonist) is a prescription-only medicine occasionally used in selected patients, particularly those with coexisting allergic asthma. The MHRA has issued a Drug Safety Update highlighting the risk of neuropsychiatric reactions (including sleep disturbances, mood changes, and suicidal ideation) associated with montelukast. It should only be used under medical supervision when other treatments are insufficient.

Saline nasal irrigation (e.g., nasal rinses or sprays) is a safe, non-pharmacological adjunct that can help clear allergens and secretions from the nasal passages and may improve comfort alongside other treatments.

Which Antihistamines and Treatments Do NHS and NICE Recommend?

NICE Clinical Knowledge Summaries (CKS) and NHS guidance provide a clear framework for managing seasonal allergic rhinitis in both adults and children. The approach is broadly stepwise, beginning with the least invasive and most cost-effective options before escalating treatment.

For mild to moderate symptoms, NICE CKS recommends starting with a non-sedating oral antihistamine such as cetirizine (10 mg once daily), loratadine (10 mg once daily), or fexofenadine (120 mg once daily for adults and adolescents aged 12 and over; available as a pharmacy medicine). These are available over the counter and are considered safe for most adults. Loratadine and cetirizine are also licensed for use in children, with age-appropriate dosing as specified in the product labelling.

For moderate to severe nasal symptoms, particularly congestion, NICE CKS recommends an intranasal corticosteroid spray as the preferred treatment and the most effective single agent for nasal symptom control. Beclometasone dipropionate, fluticasone propionate, and mometasone furoate nasal sprays are all available as pharmacy medicines for adults without a prescription (age restrictions apply; consult the product labelling or a pharmacist). A prescription is required for children below the licensed age thresholds and for higher-strength formulations.

Where symptoms affect both the nose and eyes, a combination approach — oral antihistamine plus intranasal corticosteroid — is supported by NICE CKS. When nasal symptoms persist despite an intranasal corticosteroid alone, a combination intranasal azelastine/fluticasone spray (prescription-only) is an effective step-up option, as supported by BSACI guidance.

The MHRA and NHS advise that patients with persistent or poorly controlled symptoms should be reviewed by their GP, who may consider referral to an allergy specialist or initiation of allergen immunotherapy (desensitisation). Immunotherapy is available on the NHS for selected patients with confirmed IgE-mediated allergic rhinitis whose symptoms remain severe despite optimal pharmacotherapy. Confirmation of the specific allergen by skin-prick testing or specific IgE blood testing is required before referral.

How to Choose the Right Medication for Your Symptoms

Selecting the most appropriate allergy medication depends on several factors: the predominant symptoms you experience, the timing and duration of your allergy season, your lifestyle, and any other health conditions or medicines you take.

If your main symptoms are sneezing, itching, and runny nose, a non-sedating oral antihistamine taken daily throughout your pollen season is a practical and effective starting point. Cetirizine may have a slightly faster onset of action than loratadine, though both are well tolerated; fexofenadine is a useful alternative for those who find cetirizine mildly sedating.

If nasal congestion is your primary complaint, an intranasal corticosteroid spray is likely to offer better relief than an antihistamine alone. It is important to use the correct technique — directing the spray towards the outer wall of the nostril, away from the nasal septum, and breathing in gently — to maximise delivery and minimise side effects such as nosebleeds. Starting the spray 1–2 weeks before your expected season can help establish a protective anti-inflammatory effect before symptoms begin.

If you need rapid nasal relief or find that a corticosteroid spray alone is insufficient, an intranasal antihistamine (e.g., azelastine nasal spray) or a combination azelastine/fluticasone spray (on prescription) may be considered — discuss this with your GP or pharmacist.

For eye symptoms, antihistamine eye drops used alongside systemic treatment can provide targeted relief. Sodium cromoglicate eye drops are a gentler option suitable for children and those who prefer a preservative-free formulation.

Saline nasal irrigation can be used as a safe adjunct to help clear pollen and secretions from the nasal passages.

Practical measures to support medication:

• Check daily pollen counts via the Met Office or NHS website

• Shower and change clothes after spending time outdoors

• Wear wraparound sunglasses to reduce pollen contact with eyes

• Keep windows closed during high pollen periods

• Avoid drying laundry outside during peak pollen season

If over-the-counter treatments are not providing adequate control after 2–4 weeks of correct use, it is advisable to speak with a pharmacist or GP about stepping up treatment.

Side Effects, Safety Considerations, and Who Should Seek GP Advice

When used as directed, most seasonal allergy medications are generally well tolerated. However, it is important to be aware of potential side effects, important precautions, and situations where professional medical advice is needed.

Second-generation antihistamines are generally well tolerated. Cetirizine can cause mild drowsiness in some individuals; patients should be cautious when driving or operating machinery until they know how the medication affects them. Fexofenadine is considered the least sedating of the commonly used options. First-generation antihistamines such as chlorphenamine carry a significant sedation risk and are not recommended for daytime use. They should be avoided in older adults, who may be more susceptible to anticholinergic effects including urinary retention, dry mouth, and confusion.

Intranasal corticosteroids, when used correctly, have low systemic absorption and are considered safe for seasonal use. Occasional local side effects include nasal dryness, mild nosebleeds, and irritation. These can often be managed by adjusting technique or temporarily reducing frequency. At high doses or with prolonged use, some systemic absorption may occur; follow the recommended dose and duration on the product labelling.

Decongestants carry cardiovascular risks and should be avoided in people with hypertension, heart disease, hyperthyroidism, glaucoma, or prostatic hypertrophy, and must not be used with MAOIs. Topical nasal decongestants must not be used for more than 7 days.

Special populations require particular consideration:

• Pregnant or breastfeeding women: consult your GP or pharmacist before starting any allergy medication. Based on available safety data, loratadine or cetirizine are generally considered the preferred oral antihistamines during pregnancy; fexofenadine is usually avoided in pregnancy unless specifically advised by a prescriber. For further guidance, refer to the UKTIS/bumps resources on antihistamines in pregnancy

• Children: only use age-appropriate formulations and doses as specified in the product licence

• Older adults: avoid first-generation antihistamines and use decongestants with caution or not at all, particularly in the presence of hypertension or cardiovascular disease

• People with liver or kidney impairment: may require dose adjustments for certain antihistamines; seek pharmacist or GP advice

Seek urgent medical attention (call 999 or go to A&E) if you experience:

• Sudden severe difficulty breathing, wheezing, or throat tightening

• Swelling of the face, lips, tongue, or throat

• Severe eye pain or sudden changes in vision

These may indicate anaphylaxis or another serious condition requiring emergency treatment.

Speak to your GP if:

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

• Over-the-counter treatments have failed after a reasonable trial period with correct technique

• You develop symptoms outside the typical pollen season, suggesting a perennial allergy

• You experience wheezing or chest tightness alongside nasal symptoms, which may indicate allergic asthma requiring separate assessment

• You are unsure whether your symptoms are due to allergy or another condition such as sinusitis or a structural nasal problem

If you think you have experienced a side effect from any allergy medication, you can report it to the MHRA Yellow Card Scheme at yellowcard.mhra.gov.uk. This helps the MHRA monitor the safety of medicines used in the UK.

Frequently Asked Questions