Allergy and immunology
Medicines for Food allergy
An immune reaction to a particular food — ranging from mild itching and hives to a life-threatening reaction — where the cornerstone of care is strict avoidance of the trigger, and anyone at risk of a severe reaction carries an adrenaline auto-injector.
Education and reference only. This explains which medicines are used and why, in plain language — it deliberately contains no doses and is not a substitute for advice from your doctor or pharmacist. Always discuss your own treatment with a qualified clinician, and check the BNF and the product labelling for prescribing detail.
Quick answer
What is Food allergy?
A food allergy is when the immune system reacts to a food it has wrongly identified as harmful. The most common triggers are cow's milk, egg, peanut, tree nuts, fish, shellfish, soya and wheat, although many other foods can be involved.
- How it is treated: The foundation of managing a food allergy is identifying the trigger and then avoiding it completely.
- Self-care: Reading every food label, double-checking ingredients when eating out or buying new products, avoiding cross-contamination at home, carrying any prescribed adrenaline auto-injectors at all times, wearing medical-alert identification, and making sure family, friends, schools or workplaces know about the allergy and how to respond all help to reduce risk and keep reactions manageable.
- When to seek help: See your GP if you think you or your child reacts to a particular food, so the allergy can be confirmed and you can be advised on avoidance and, where needed, an adrenaline auto-injector.
What it is
A food allergy is when the immune system reacts to a food it has wrongly identified as harmful. The most common triggers are cow's milk, egg, peanut, tree nuts, fish, shellfish, soya and wheat, although many other foods can be involved. Reactions usually come on quickly after eating, sometimes within minutes, and can range from mild to severe. Milder reactions may cause an itchy or tingly mouth, raised itchy hives, swelling of the lips, a runny nose, or tummy upset such as nausea, cramps, vomiting or diarrhoea. At the other end of the spectrum, a reaction can be severe and affect breathing and circulation — this is anaphylaxis, and it is a medical emergency. A food allergy is different from a food intolerance: an intolerance (such as difficulty digesting lactose) does not involve the immune system, tends to come on more slowly and, while unpleasant, is not life-threatening. Allergy is confirmed through a careful history and allergy testing, usually arranged through a GP or allergy specialist, rather than by guesswork or unproven tests.
How it is treated
The foundation of managing a food allergy is identifying the trigger and then avoiding it completely. That means learning to read food labels carefully, asking about ingredients when eating out, and being alert to cross-contamination where allergens can be transferred between foods. Allergens such as the main culprits must be declared on packaged foods, which helps, but vigilance is still needed. Antihistamines can ease the mild symptoms of a minor reaction, such as itching and hives. The most important safety measure, however, is being prepared for a severe reaction: anyone judged to be at risk of anaphylaxis is prescribed an adrenaline auto-injector (such as an EpiPen) and shown how and when to use it, and is advised to carry two with them at all times. A personalised allergy action plan, along with informing schools, workplaces and those close to the person, is part of staying safe. Diagnosis and ongoing care are usually guided by a GP or an allergy specialist, who can confirm the allergy, advise on avoidance and, in selected cases, consider specialist options.
For this condition, these medicines
Medicine classes used for Food allergy
Each links to a full, dose-free guide — what it is, how it works, who can and cannot use it, side effects, interactions and FAQs.
Symptom checker
Symptoms that can point to Food allergy
Food allergy can be one cause of these symptoms. Each guide explains the other possible causes and the red-flag warning signs that mean you should get urgent help:
Beyond medication
Lifestyle and self-care
Reading every food label, double-checking ingredients when eating out or buying new products, avoiding cross-contamination at home, carrying any prescribed adrenaline auto-injectors at all times, wearing medical-alert identification, and making sure family, friends, schools or workplaces know about the allergy and how to respond all help to reduce risk and keep reactions manageable.
When to get help
When to see a doctor
See your GP if you think you or your child reacts to a particular food, so the allergy can be confirmed and you can be advised on avoidance and, where needed, an adrenaline auto-injector. Call 999 immediately and treat it as a life-threatening emergency if a reaction involves swelling of the tongue or throat, difficulty breathing, wheeze, a hoarse voice or trouble swallowing, feeling faint, dizzy or collapsing, or sudden widespread hives with these features — this is anaphylaxis. If an adrenaline auto-injector has been prescribed, use it straight away without waiting, then call 999 and say "anaphylaxis"; lie the person flat (or sit them up if breathing is hard) and be ready to give a second injector after a few minutes if there is no improvement.
Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.
Answers
Food allergy: frequently asked questions
What medicines are used for food allergy?
For mild reactions, antihistamines are used to ease symptoms such as itching, hives, a runny nose and an itchy mouth. They are not enough for a severe reaction. Anyone judged to be at risk of a severe reaction (anaphylaxis) is prescribed an adrenaline auto-injector, such as an EpiPen, which is the emergency treatment and must be used immediately if a severe reaction begins. The mainstay of day-to-day management, though, is not medicine at all but strict avoidance of the food that triggers the allergy.
What is the difference between a food allergy and a food intolerance?
A food allergy involves the immune system reacting to a food and can come on fast, sometimes within minutes, occasionally causing a severe, life-threatening reaction. A food intolerance — such as difficulty digesting lactose — does not involve the immune system, usually comes on more slowly, and tends to cause digestive symptoms like bloating, cramps or diarrhoea. Intolerance can make you feel unwell but is not life-threatening, whereas a true allergy can be, which is why it is important to have a suspected allergy properly assessed.
When should I use an adrenaline auto-injector?
Use it straight away, without waiting, if there are any signs of a severe reaction — swelling of the tongue or throat, difficulty breathing or wheeze, a hoarse voice or trouble swallowing, feeling faint or dizzy, or collapse. It is always safer to use the injector early than to delay. After using it, call 999 and say "anaphylaxis", and be ready to give a second injector after about five minutes if there is no improvement. Even if the person seems to recover, they still need emergency medical assessment.
Can a food allergy be cured?
There is no simple cure, and for most people managing a food allergy means avoiding the trigger and being prepared for accidental exposure. Some children do grow out of certain allergies, particularly to milk and egg, while allergies to peanuts, tree nuts, fish and shellfish are more likely to be lifelong. In selected cases, specialists may consider carefully supervised treatments to build tolerance, but these are not suitable for everyone and are only done under expert care. Avoidance and carrying any prescribed adrenaline auto-injector remain the safe foundation.
Keep reading
Related articles
Sources
Where this is drawn from
- NICE CKS: Food allergy.
- Anaphylaxis UK
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