Digestive
Medicines for Food intolerance
Difficulty digesting or reacting to certain foods, causing symptoms like bloating and tummy upset — unpleasant but, unlike food allergy, not usually dangerous.
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 intolerance?
Food intolerance means having difficulty digesting a particular food, or reacting to it, in a way that causes unpleasant symptoms — most often digestive ones such as bloating, wind, tummy pain, diarrhoea or nausea, and sometimes headaches or feeling generally unwell. Symptoms usually come on more slowly than in a food allergy (over hours), and depend on how much of the food is eaten.
- How it is treated: The main approach is identifying and limiting the foods that trigger symptoms, while keeping the diet balanced.
- Self-care: Keeping a food and symptom diary, limiting identified trigger foods while keeping the diet balanced, and getting dietitian support (especially before cutting out food groups) all help.
- When to seek help: See a GP for persistent digestive symptoms linked to food, so that conditions such as coeliac disease or other causes can be excluded and, if needed, dietitian support arranged.
What it is
Food intolerance means having difficulty digesting a particular food, or reacting to it, in a way that causes unpleasant symptoms — most often digestive ones such as bloating, wind, tummy pain, diarrhoea or nausea, and sometimes headaches or feeling generally unwell. Symptoms usually come on more slowly than in a food allergy (over hours), and depend on how much of the food is eaten. Importantly, food intolerance does not involve the immune system in the way a food allergy does, and it does not cause the dangerous, rapid allergic reactions (anaphylaxis) that true food allergies can. Common examples include lactose intolerance and sensitivity to certain fermentable carbohydrates (which are relevant in irritable bowel syndrome). Identifying trigger foods can be difficult, and there is no reliable single test for most food intolerances.
How it is treated
The main approach is identifying and limiting the foods that trigger symptoms, while keeping the diet balanced. Keeping a food and symptom diary can help spot patterns, and, under guidance, carefully removing a suspected food and then reintroducing it can confirm whether it is responsible. For gut symptoms, particularly with irritable bowel syndrome, a structured, dietitian-led approach (such as a low-FODMAP diet done properly and temporarily) can help identify triggers. It is important to avoid unnecessarily cutting out large food groups, which can lead to a poor diet, so support from a GP and registered dietitian is valuable. Commercial "food intolerance tests" (such as certain blood or hair tests) are not reliable and are not recommended.
For this condition, these medicines
Medicine classes used for Food intolerance
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.
Beyond medication
Lifestyle and self-care
Keeping a food and symptom diary, limiting identified trigger foods while keeping the diet balanced, and getting dietitian support (especially before cutting out food groups) all help. Avoid unreliable commercial "intolerance tests".
When to get help
When to see a doctor
See a GP for persistent digestive symptoms linked to food, so that conditions such as coeliac disease or other causes can be excluded and, if needed, dietitian support arranged. Avoid restrictive diets without advice.
Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.
Answers
Food intolerance: frequently asked questions
What is the difference between food intolerance and food allergy?
Food intolerance is difficulty digesting or reacting to a food, causing usually slower, non-dangerous symptoms (like bloating). Food allergy is an immune reaction that can be rapid and, in some cases, life-threatening. They are quite different.
Are food intolerance tests reliable?
Commercial food intolerance tests (such as certain blood or hair tests) are not reliable and are not recommended. Keeping a food diary and, where needed, a dietitian-guided elimination approach are more useful.
Sources
Where this is drawn from
- NHS — Food intolerance
- British Dietetic Association guidance
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