Skip Ribbon Commands
Skip to main content


Drug Class: Commonly Known As: Category:
Osmotic laxative Duphalac

Lactulose - Side Effects, Precautions, and Contraindications

What side effects can Lactulose cause?

  • ​Lactulose may cause some discomfort such as passing gas, cramps, nausea and vomiting.

Consult your healthcare professional if the symptoms do not go away or become bothersome.

Consult your healthcare professional if you have bleeding from the anus.

The symptoms of a drug allergy include one or more of the following:

  • Swollen face/eyes/lips/tongue
  • Difficulty in breathing
  • Itchy skin rashes over your whole body

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

Before taking Lactulose, what precautions must I follow?

Inform your healthcare professional if:

  • You are allergic to this medication or any of the other ingredients of this medication. This includes a history of lactose or milk intolerance.
  • You are on a galactose or lactose free (or milk free) diet. This preparation contains both lactose and galactose.
  • You are pregnant, planning to become pregnant, or breastfeeding.
  • You are taking any other medications, including supplements, traditional medications and herbal remedies.
  • You have or had history of bowel obstruction (blockage in the small or large intestine)

What food or medicine must I avoid when I take Lactulose?

​Inform your healthcare professional if you are taking or intend to take any other medication, supplements, traditional medications or herbal remedies.

Lactulose - Additional Information

  • Updated on Monday, September 30, 2019
  • Article contributed by PSS National Medication Information Workgroup

    The information provided is not intended as medical advice. Terms of use. Information provided by SingHealth

    Find Your Medicines