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Lactulose is an osmotic laxative that increases the water content of stools, making them softer and easier to pass. It is commonly used for both short-term and long-term constipation and is suitable for adults, older people, and children when used as directed.

Lactulose may also be prescribed for certain liver conditions, such as hepatic encephalopathy, where it helps reduce the build-up of toxins in the blood. When used for constipation, it works gently and does not cause dependency.

It may take 24–48 hours for lactulose to produce an effect. Adequate fluid intake should be maintained during treatment.

If constipation persists for more than one week, or if symptoms such as severe abdominal pain, vomiting, or blood in stools occur, medical advice should be sought.


How to Take Lactulose

  • Lactulose can be taken neat or mixed with water or fruit juice
  • The usual adult dose for constipation is 15–45 ml daily, adjusted according to response
  • Once bowel movements improve, the dose may be reduced to a maintenance dose of 15–30 ml daily
  • Always follow the directions on the label or those given by your prescriber or pharmacist
How long does lactulose take to work?

Lactulose usually works within 1–2 days, although this may vary between individuals.

Yes, lactulose can be used daily for short- or long-term constipation when taken as directed.

Some people may experience mild bloating or wind when starting treatment, which usually settles as the body adjusts.

Lactulose can usually be taken with other medicines, but it is advisable to space doses apart. Speak to your pharmacist if unsure.

Yes, lactulose is suitable for longer-term use under medical or pharmacist guidance.

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