What medication is good for allergies depends on your specific symptoms, the type of allergy, and your individual circumstances. In the UK, a range of effective treatments is available — from non-drowsy antihistamines and corticosteroid nasal sprays to mast cell stabiliser eye drops — many of which can be purchased over the counter from a pharmacy without a prescription. Whether you are managing hay fever, allergic conjunctivitis, urticaria, or a more complex allergy, understanding how each medication works can help you make an informed choice. This guide covers the main options available in the UK, aligned with NHS and NICE guidance.

Common Types of Allergy Medication Available in the UK

UK allergy medications include antihistamines, corticosteroid nasal sprays, eye drops, and decongestants, with many first-line options available over the counter from pharmacies.

Allergy medications in the UK fall into several broad categories, each targeting different aspects of the allergic response. The most widely used include antihistamines, corticosteroid nasal sprays, eye drops, and decongestants. In more complex or severe cases, a specialist may consider allergen immunotherapy. People at risk of anaphylaxis may be prescribed an adrenaline auto-injector — an emergency rescue device, not a day-to-day allergy treatment (see below).

For common conditions such as hay fever (allergic rhinitis), allergic conjunctivitis, and urticaria (hives), many first-line treatments are available over the counter from pharmacies without a prescription. The NHS recommends starting with the least invasive, most appropriate option for your symptom profile before escalating to prescription-only treatments.

If you suspect a food allergy, it is important to seek a GP assessment rather than self-treating. Food allergy can carry a risk of anaphylaxis, and formal diagnosis — including identification of the trigger — is essential before any management plan is put in place.

No single medication suits every person or every allergy. Factors such as age, other medical conditions, pregnancy, and concurrent medications all influence which treatment is most appropriate. A pharmacist is an excellent first point of contact for guidance on over-the-counter options, while a GP can assess whether prescription treatments or onward referral to an allergy specialist is warranted.

If you experience a suspected side effect from any allergy medication, you can report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or through the Yellow Card app.

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Antihistamines: What They Are and How They Work

Antihistamines block histamine H1 receptors to relieve sneezing, itching, and watery eyes; second-generation options (cetirizine, loratadine) are preferred for daytime use due to their non-drowsy profile.

Antihistamines are the most commonly used allergy medications in the UK and are available in both oral tablet and liquid forms. They work by blocking histamine H1 receptors, preventing histamine — a chemical released by the immune system during an allergic reaction — from binding to tissues and triggering symptoms such as sneezing, itching, a runny nose, and watery eyes.

Antihistamines are broadly divided into two generations:

• First-generation antihistamines (e.g., chlorphenamine) are effective but are known to cause drowsiness, impaired concentration, and dry mouth. They are generally not recommended for daytime use if you need to drive or operate machinery.

• Second-generation antihistamines (e.g., cetirizine, loratadine, fexofenadine) are described as non-drowsy or minimally sedating and are preferred for most adults and children for daytime allergy relief. NICE guidance supports these as first-line treatment for allergic rhinitis. However, even second-generation antihistamines can impair performance in some individuals — always follow the patient information leaflet and avoid driving or operating machinery if you feel affected.

Most oral antihistamines begin working within 30 to 60 minutes and can be taken as needed or daily during allergy season. Do not take two oral antihistamines at the same time unless specifically advised to do so by a healthcare professional.

Antihistamines are generally well tolerated, though some individuals may experience headache, dry mouth, or mild gastrointestinal upset. If you are pregnant or breastfeeding, loratadine or cetirizine are generally considered the preferred options, but you should seek advice from a pharmacist or GP before starting any antihistamine. Always consult a pharmacist if you are taking other medications, as interactions can occur.

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Other Treatments: Nasal Sprays, Eye Drops and Steroids

Corticosteroid nasal sprays are the most effective first-line treatment for nasal allergy symptoms, while mast cell stabiliser eye drops treat allergic conjunctivitis; oral corticosteroids are reserved for severe cases under medical supervision.

For people whose allergy symptoms are predominantly nasal — such as congestion, sneezing, and a blocked or runny nose — corticosteroid nasal sprays are often considered the most effective first-line treatment. Preparations such as beclometasone and fluticasone are available over the counter and work by reducing inflammation in the nasal passages. Unlike antihistamines, they may take several days of regular use to reach full effect, so they are best started before allergy season begins where possible. NICE recommends intranasal corticosteroids as the preferred treatment for moderate-to-severe allergic rhinitis.

When using a corticosteroid nasal spray, direct the nozzle towards the outer wall of the nostril (away from the nasal septum) to reduce the risk of local side effects such as nasal irritation or nosebleeds.

Antihistamine nasal sprays, such as azelastine, act more quickly and can be used alongside corticosteroid sprays in more troublesome cases. Decongestant nasal sprays (e.g., xylometazoline) can provide rapid relief from nasal congestion but should not be used for more than five to seven consecutive days due to the risk of rebound congestion (rhinitis medicamentosa). Check the patient information leaflet for age restrictions, as these products are not suitable for young children.

For allergic conjunctivitis, mast cell stabiliser eye drops such as sodium cromoglicate are available over the counter and are generally safe for regular use during allergy season. They work by preventing mast cells from releasing histamine and other inflammatory chemicals. Antihistamine eye drops are also available; however, some preparations (such as olopatadine) are prescription-only in the UK — your pharmacist or GP can advise on the most appropriate option for you.

In cases of severe or persistent allergic symptoms, a GP may prescribe a short course of oral corticosteroids (e.g., prednisolone). These are powerful anti-inflammatory agents and are reserved for exceptional circumstances where other treatments have not provided adequate relief. They should only be taken under medical supervision and for the shortest effective duration, due to the risk of significant side effects with prolonged use.

In selected cases, a GP may also consider montelukast (a leukotriene receptor antagonist) as a prescription option, particularly where rhinitis and asthma coexist. The MHRA has issued a safety warning regarding a risk of neuropsychiatric reactions with montelukast; patients and carers should be made aware of this before starting treatment.

Choosing the Right Allergy Relief for Your Symptoms

Match your medication to your predominant symptoms: antihistamines for sneezing and itch, corticosteroid nasal sprays for congestion, and eye drops for ocular symptoms; consult a GP if over-the-counter treatments fail after two to four weeks.

Selecting the most appropriate allergy medication depends on identifying your predominant symptoms and understanding how each treatment works. The following guidance can help:

• Sneezing, itching, runny nose, and watery eyes: A non-drowsy oral antihistamine (e.g., cetirizine or loratadine) is a practical starting point.

• Nasal congestion and blocked nose: A corticosteroid nasal spray is likely to be more effective than an antihistamine alone.

• Eye symptoms: Mast cell stabiliser eye drops (e.g., sodium cromoglicate) provide targeted, over-the-counter relief for allergic conjunctivitis.

• Combined nasal and eye symptoms: A combination of a nasal corticosteroid spray and an oral antihistamine may be recommended.

• Urticaria (hives): Non-sedating oral antihistamines are the recommended first-line treatment. If symptoms are not adequately controlled, consult your GP.

• Skin inflammation associated with eczema: The mainstay of eczema management is regular use of emollients and, when needed, topical corticosteroid creams — in line with NICE guidance. Non-sedating antihistamines are not routinely recommended for eczema-related itch. A short course of a sedating antihistamine at night may occasionally be considered by a clinician to help with sleep disturbance caused by severe itch, but this should be discussed with a GP or pharmacist first.

It is also important to consider practicality and adherence. A once-daily non-drowsy tablet may suit someone with a busy lifestyle, whereas a nasal spray used twice daily may be more appropriate for someone with predominantly nasal symptoms. Your pharmacist can help you weigh up the options based on your specific circumstances, including any other medications you take. If over-the-counter treatments fail to control symptoms adequately after two to four weeks, it is advisable to consult your GP.

When to See a GP or Seek Further Allergy Assessment

See a GP if symptoms are severe, persistent, or uncontrolled after two to four weeks of over-the-counter treatment, or if you suspect a food allergy or anaphylaxis risk; call 999 immediately for suspected anaphylaxis.

While many allergy symptoms can be managed effectively with over-the-counter treatments, there are circumstances where it is important to seek professional medical advice. You should 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 are unsure what you are allergic to and require formal allergy testing

• You experience symptoms of asthma alongside your allergies (e.g., wheezing, chest tightness, breathlessness)

• You are pregnant or breastfeeding and need guidance on safe medication choices

• A child's allergy symptoms are not well controlled or are affecting their schooling or development

• You suspect a food allergy — avoidance of the trigger is essential and formal assessment is needed

If you are referred for allergy testing, this will typically involve skin prick testing or specific IgE blood tests. It is worth noting that commercially available IgG 'food intolerance' tests are not recommended for diagnosing allergy and should not be used in place of clinically validated tests.

In cases of suspected anaphylaxis — a severe, life-threatening allergic reaction characterised by throat swelling, difficulty breathing, a sudden drop in blood pressure, or loss of consciousness — call 999 immediately. If an adrenaline auto-injector has been prescribed, use it without delay. If there is no improvement after five minutes and a second device is available, a second dose may be given. While waiting for emergency services: lie flat with your legs raised (or on your left side if pregnant); do not stand or walk. Always seek emergency care even if symptoms appear to improve after using an adrenaline auto-injector.

For complex or difficult-to-manage allergies, your GP may refer you to an NHS allergy clinic for specialist assessment. Where appropriate, a specialist may discuss allergen immunotherapy (desensitisation) — a treatment that involves gradually increasing exposure to an allergen to reduce sensitivity. This is a specialist-led treatment, typically lasting around three years, and is suitable for selected IgE-mediated conditions such as pollen allergy, house dust mite allergy, or insect venom allergy. NICE guidance supports referral when the diagnosis is uncertain or when standard treatments are insufficient.

Buying Allergy Medication Safely in the UK

Buy allergy medication only from MHRA-regulated, GPhC-registered pharmacies; check for a product licence number and read the patient information leaflet before use.

In the UK, many effective allergy medications are available to purchase without a prescription from pharmacies, supermarkets, and registered online retailers. However, it is important to buy from reputable, regulated sources to ensure product safety and authenticity. The Medicines and Healthcare products Regulatory Agency (MHRA) regulates all medicines sold in the UK, and legitimate products will carry a product licence (PL) number on the packaging.

When purchasing allergy medication online, always use a registered pharmacy — look for the General Pharmaceutical Council (GPhC) logo on the website, which confirms the retailer is legally authorised to sell medicines. You can verify a pharmacy's registration via the GPhC online register. Avoid purchasing from unverified websites, as counterfeit or substandard products pose a genuine safety risk. The MHRA provides guidance on buying medicines safely online.

Before starting any new allergy medication, it is good practice to:

• Read the patient information leaflet carefully, including contraindications and drug interactions

• Speak to a pharmacist if you are unsure whether a product is suitable for you

• Check the expiry date and storage requirements

• Avoid doubling up on medications containing the same active ingredient (e.g., some cold and flu remedies already contain antihistamines)

If you experience a suspected side effect from any medication, report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or through the Yellow Card app.

Finally, remember that medication manages symptoms but does not cure the underlying allergy. Where possible, reducing exposure to known allergens — such as keeping windows closed during high pollen counts, using allergen-proof bedding, or avoiding known food triggers — remains an important part of overall allergy management alongside any medication.

Frequently Asked Questions