Lactose intolerance means your body doesn't make enough lactase — the enzyme that digests lactose, the natural sugar in milk. Undigested lactose ferments in the gut, causing bloating, wind, stomach cramps and diarrhoea, usually within a few hours of having milk or dairy. It's common and uncomfortable, but not dangerous in itself.
Treatments & products
GSL
Colief Infant Drops 15ml
Colief Infant Drops add the lactase enzyme to your baby's usual milk to break down...
only £13.99
View ›
GSL
Milkaid Lactase Enzyme Tablets
Milkaid is a lactase enzyme food supplement that improves lactose digestion in...
only £9.99
View ›
Lactose Intolerance — your questions, answered
Is lactose intolerance the same as a milk allergy?
No. A milk allergy is an immune reaction to milk protein and can be serious, sometimes causing rashes, wheezing or swelling — it's most common in young children. Lactose intolerance is a digestive problem and doesn't cause allergic reactions. If you suspect an allergy, especially in a child, see your GP rather than self-treating.
How do lactase tablets like Milkaid work?
They top up the enzyme you're short of. Taken just before eating or drinking something containing dairy, Milkaid lactase tablets help break down the lactose so it's digested normally — meaning fewer symptoms afterwards. They're a food supplement rather than a medicine, and they're handy for meals out or times when avoiding dairy is difficult.
Do I need to cut out dairy completely?
Usually not. Most people with lactose intolerance can manage small amounts, and some dairy foods — hard cheeses and butter, for example — are naturally low in lactose. Lactose-free milks are widely available too. If you do cut down on dairy, make sure you're still getting enough calcium; our pharmacist can suggest suitable supplements.
Should I see a GP before assuming it's lactose intolerance?
Yes, it's wise — the symptoms overlap with IBS, coeliac disease and other gut conditions, so it's worth confirming the cause before cutting out a food group long-term. See your GP promptly if you have blood in your poo, unexplained weight loss or persistent symptoms, and always before restricting a child's diet.
Information only — always read the patient leaflet and ask our pharmacist if you're unsure. Prescription treatments are supplied only after a consultation and our pharmacist's approval.