Medication for grass allergy is a key part of managing hay fever, one of the most common allergic conditions in the UK. Triggered by grass pollen proteins between May and July, grass pollen allergy causes sneezing, itchy eyes, nasal congestion, and fatigue — symptoms that can significantly affect quality of life. Fortunately, a range of effective treatments is available, from over-the-counter antihistamines and nasal sprays to prescription therapies and long-term immunotherapy. This guide explains the NHS-recommended options, how each medication works, and how to use them safely.

Understanding Grass Pollen Allergy and Its Symptoms

Grass pollen allergy, commonly referred to as hay fever or allergic rhinitis, is one of the most prevalent allergic conditions in the UK. It is triggered when the immune system overreacts to grass pollen proteins, mistakenly identifying them as harmful substances. This immune response leads to the release of histamine and other inflammatory mediators, which produce the characteristic symptoms of the condition. Grass pollen season in the UK generally runs from mid-May to July, peaking in June and July, though it can sometimes extend into August. Pollen counts vary day to day; the Met Office publishes daily pollen forecasts to help people plan their activities accordingly.

The symptoms of grass pollen allergy can range from mild to significantly debilitating and may include:

• Sneezing and a runny or blocked nose

• Itchy, red, or watery eyes (allergic conjunctivitis)

• An itchy throat, mouth, or ears

• Headaches and facial pressure caused by sinus congestion

• Fatigue, particularly during high pollen periods

In individuals with asthma, grass pollen exposure can also trigger or worsen respiratory symptoms such as wheezing, chest tightness, and shortness of breath. According to NHS guidance, people with both asthma and hay fever should be particularly vigilant during peak pollen season, as the risk of asthma attacks increases considerably. Monitoring daily pollen forecasts and limiting outdoor exposure on high-pollen days are practical measures that should be used alongside appropriate first-line medicines — not as a substitute for timely treatment.

When to seek urgent help: If you or someone else develops severe or rapidly worsening breathlessness, wheezing that does not respond to a reliever inhaler, stridor (a high-pitched sound when breathing), or signs of anaphylaxis (throat or facial swelling, difficulty swallowing, collapse), call 999 immediately or go to your nearest emergency department.

NHS-Recommended Medications for Grass Allergy

The NHS recommends a stepwise approach to managing grass pollen allergy, beginning with over-the-counter (OTC) treatments and escalating to prescription therapies if symptoms remain poorly controlled. NICE Clinical Knowledge Summary (CKS): Allergic rhinitis supports the use of non-sedating antihistamines as a first-line treatment for mild to moderate allergic rhinitis, with intranasal corticosteroids recommended when nasal symptoms are more persistent or troublesome.

The main categories of medication for grass allergy used in the UK include:

• Oral antihistamines – such as cetirizine, loratadine, and fexofenadine, which are available OTC and help relieve sneezing, itching, and runny nose

• Intranasal corticosteroid sprays – such as beclometasone dipropionate or fluticasone propionate, which reduce nasal inflammation and are considered the most effective treatment for persistent nasal symptoms

• Antihistamine or mast cell stabiliser eye drops – used specifically for allergic conjunctivitis (see the following section for detail on individual products and their availability)

• Decongestants – such as xylometazoline (nasal spray) or pseudoephedrine (oral), which may provide short-term relief from nasal congestion but should not be used for more than seven days continuously; pseudoephedrine should be avoided in people with hypertension, cardiovascular disease, or those taking monoamine oxidase inhibitors (MAOIs), and is not suitable for young children — always check age restrictions on the packaging or with a pharmacist

Additional options that a GP or specialist may consider include:

• Combination intranasal azelastine/fluticasone propionate spray – a prescription-only option when either agent alone provides insufficient relief

• Intranasal ipratropium bromide – for troublesome watery rhinorrhoea not controlled by other treatments

• Saline nasal irrigation – a safe, non-pharmacological adjunct that can help clear pollen and mucus from the nasal passages

• Montelukast – occasionally considered in patients with co-existing asthma and allergic rhinitis, under medical supervision

For patients whose symptoms are not adequately controlled with standard OTC treatments, a GP may prescribe stronger intranasal steroids, combination therapies, or refer for specialist allergy assessment. Patients should not self-escalate treatment without professional guidance, particularly when using corticosteroids or decongestants over extended periods.

If you suspect a medication is causing a side effect, you can report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or through the Yellow Card app.

Antihistamines, Nasal Sprays and Eye Drops Explained

Understanding how each type of medication works can help patients use them more effectively and safely.

Antihistamines act by blocking H1 histamine receptors, thereby preventing histamine from binding and triggering allergic symptoms. Second-generation antihistamines — such as cetirizine, loratadine, and fexofenadine — are preferred over older first-generation options (e.g., chlorphenamine) because they cause significantly less sedation and are longer-acting, typically providing 24-hour symptom relief with once-daily dosing. However, even second-generation antihistamines may cause mild drowsiness in some individuals, and patients should be cautious when driving or operating machinery.

Intranasal corticosteroid sprays work by reducing local inflammation in the nasal passages through suppression of the inflammatory cascade. Preparations such as fluticasone propionate and beclometasone dipropionate are available OTC in the UK. These sprays are most effective when started at least two weeks before the expected pollen season and used consistently throughout. Patients should be counselled on correct technique — directing the nozzle away from the nasal septum towards the outer wall of the nostril — to minimise the risk of nosebleeds or nasal irritation.

Eye drops for allergic conjunctivitis fall into two main categories:

• Mast cell stabilisers – sodium cromoglicate eye drops work by stabilising mast cells and preventing histamine release. They are available OTC and are a well-established first-line option for allergic eye symptoms.

• Antihistamine eye drops – ketotifen is available OTC and provides rapid relief of itching and redness. Olopatadine, which combines antihistamine and mast cell stabilising properties, is prescription-only in the UK and would need to be prescribed by a GP or specialist.

Patients who wear contact lenses should check product-specific guidance, as some formulations are not suitable for use with lenses.

When to seek urgent eye assessment: If you experience eye pain, photophobia (sensitivity to light), reduced or blurred vision, or a unilateral (one-sided) red eye, do not treat these symptoms with OTC drops alone. Seek same-day assessment from an optometrist, urgent eye clinic, or urgent care centre, as these may indicate a condition requiring prompt treatment.

When to Consider Immunotherapy for Grass Pollen Allergy

For patients whose grass pollen allergy symptoms remain poorly controlled despite optimal pharmacological treatment, allergen immunotherapy (AIT) offers a disease-modifying option that can provide long-term relief. Unlike standard medications, which manage symptoms reactively, immunotherapy works by gradually desensitising the immune system to grass pollen allergens, reducing the underlying allergic response over time.

In the UK, two forms of immunotherapy are available for grass pollen allergy:

• Subcutaneous immunotherapy (SCIT) – administered as a series of injections in a clinical setting, typically over three to five years; each injection is given under medical supervision with a period of observation afterwards due to the small risk of a systemic allergic reaction

• Sublingual immunotherapy (SLIT) tablets – dissolvable tablets placed under the tongue; grass pollen SLIT tablets (e.g., grass pollen allergen extract [e.g., Grazax]) are licensed in the UK and approved by the MHRA. Note that licensed grass pollen SLIT products in the UK are tablets, not drops; sublingual drops for grass pollen are not routinely licensed or commissioned in the UK

NICE technology appraisal guidance (TA246) supports the use of grass pollen SLIT tablets for the treatment of grass pollen-induced rhinitis that is inadequately controlled by antihistamines and nasal corticosteroids. Patients should refer to the specific product's Summary of Product Characteristics (SmPC) and NICE TA246 for the precise eligible population and age range. Treatment should ideally be initiated at least 8 weeks before the start of the pollen season (many specialists recommend 12–16 weeks) and continued for at least three consecutive years to achieve sustained benefit.

Immunotherapy is only initiated and monitored through specialist allergy services and is not suitable for everyone. Key contraindications include severe or uncontrolled asthma, certain cardiovascular conditions, and the use of beta-blockers. Immunotherapy should not be started during pregnancy, although continuation under specialist supervision may be considered in some circumstances. Patients interested in immunotherapy should discuss this with their GP, who can refer them to an NHS allergy clinic or a specialist centre. Benefits may take one to two seasons to become fully apparent.

Buying Allergy Medication Safely in the UK

Many effective medications for grass allergy are available to purchase without a prescription from pharmacies, supermarkets, and registered online retailers in the UK. However, it is important that patients approach self-treatment thoughtfully and seek professional advice when symptoms are severe, persistent, or associated with asthma.

When purchasing allergy medication, consider the following safety guidance:

• Choose registered pharmacies – whether buying in person or online, ensure the retailer is registered with the General Pharmaceutical Council (GPhC). When buying from an online pharmacy in Great Britain, look for the UK Distance Selling Logo on the website, which links to the pharmacy's entry on the GPhC register and verifies its legitimacy. (Note: the EU common logo applies in Northern Ireland only.)

• Read the patient information leaflet carefully – pay attention to contraindications, interactions, and maximum dosing instructions

• Avoid first-generation antihistamines (e.g., chlorphenamine) if you need to drive, operate machinery, or require sustained concentration, due to their sedating properties

• Do not use nasal decongestant sprays for more than seven days without medical advice, as prolonged use can cause rebound congestion (rhinitis medicamentosa). Oral decongestants such as pseudoephedrine should be avoided if you have high blood pressure, heart disease, or are taking MAOIs, and are not suitable for young children — check age restrictions carefully

• Speak to a pharmacist if you are pregnant, breastfeeding, taking other medications, or managing a long-term health condition before starting any new allergy treatment

Patients should contact their GP if symptoms are not controlled with OTC treatments after two to four weeks, or if they experience side effects that affect daily functioning.

Seek urgent medical attention (call 999 or go to A&E) if you develop severe breathlessness or wheezing that does not respond to your reliever inhaler, stridor, throat or facial swelling, difficulty swallowing, confusion, or cyanosis (bluish discolouration of the lips or fingertips). These may indicate a serious allergic reaction or acute asthma attack requiring emergency care.

If you think a medication has caused a side effect, please report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or using the Yellow Card app. Staying informed and using medications as directed remains the cornerstone of safe, effective management of grass pollen allergy.

Frequently Asked Questions