Digestive
Medicines for Lactose intolerance
Difficulty digesting the sugar (lactose) in milk, causing bloating, wind and diarrhoea after dairy — managed by limiting lactose, not an allergy and not 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 Lactose intolerance?
Lactose intolerance is difficulty digesting lactose, the natural sugar found in milk and dairy products. It happens when the gut produces too little of the enzyme (lactase) needed to break lactose down, so undigested lactose passes into the bowel and causes symptoms such as bloating, tummy pain, wind, rumbling and diarrhoea, usually within a few hours of consuming dairy.
- How it is treated: Management involves reducing the amount of lactose in the diet to a level that does not cause symptoms — which varies between people, as many can tolerate small amounts, especially when spread through the day or taken with other foods.
- Self-care: Limiting lactose to a tolerated level, choosing lactose-free products or dairy alternatives, using lactase supplements when eating dairy, and ensuring enough calcium from other sources all help manage symptoms while keeping the diet balanced.
- When to seek help: See a GP if you have persistent bloating, wind and diarrhoea linked to dairy, to confirm the cause (and exclude other conditions), or if cutting out dairy affects your nutrition and you need dietary advice.
What it is
Lactose intolerance is difficulty digesting lactose, the natural sugar found in milk and dairy products. It happens when the gut produces too little of the enzyme (lactase) needed to break lactose down, so undigested lactose passes into the bowel and causes symptoms such as bloating, tummy pain, wind, rumbling and diarrhoea, usually within a few hours of consuming dairy. It is different from a milk allergy — it is a digestive issue, not an immune reaction, and it is uncomfortable rather than dangerous. It is very common worldwide, becomes more likely with age, and is more frequent in some ethnic groups. It can also occur temporarily after a gut infection or with some bowel conditions. It is often identified by the link between symptoms and dairy, sometimes confirmed with tests.
How it is treated
Management involves reducing the amount of lactose in the diet to a level that does not cause symptoms — which varies between people, as many can tolerate small amounts, especially when spread through the day or taken with other foods. Lactose-free milk and dairy products, and dairy alternatives, are widely available, and hard cheeses and live yoghurt are often better tolerated. Lactase enzyme supplements can help when eating dairy. Because dairy is a key source of calcium, it is important to ensure enough calcium from other sources or fortified products, and a dietitian can help keep the diet balanced. Where lactose intolerance is temporary (for example after a gut infection), it often improves over weeks.
For this condition, these medicines
Medicine classes used for Lactose 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
Limiting lactose to a tolerated level, choosing lactose-free products or dairy alternatives, using lactase supplements when eating dairy, and ensuring enough calcium from other sources all help manage symptoms while keeping the diet balanced.
When to get help
When to see a doctor
See a GP if you have persistent bloating, wind and diarrhoea linked to dairy, to confirm the cause (and exclude other conditions), or if cutting out dairy affects your nutrition and you need dietary advice.
Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.
Answers
Lactose intolerance: frequently asked questions
Is lactose intolerance the same as milk allergy?
No. Lactose intolerance is difficulty digesting the milk sugar lactose — a digestive issue that is uncomfortable but not dangerous. A milk allergy is an immune reaction to milk protein, which can be more serious. They are managed differently.
Can I still have dairy with lactose intolerance?
Many people can tolerate small amounts of lactose, especially spread through the day or with other foods, and hard cheeses and live yoghurt are often better tolerated. Lactose-free products and lactase supplements also help.
Keep reading
Related articles
Sources
Where this is drawn from
- NHS — Lactose intolerance
- British Dietetic Association guidance
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