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Lactulose is a laxative for constipation. It is also used for a condition linked to severe liver disease.
What should I know about Lactulose?
It draws water into the bowel to soften stools, and it takes at least 2 days to work.
What are the side effects?
Diarrhoea, bloating and wind are the most common side effects, and are usually mild.
Who should check first?
Ask your pharmacist if you have a medical condition or take regular medicines.
When should I get help?
Talk to your doctor if constipation has not improved after more than 3 days or symptoms get worse.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About lactulose. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.