This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.
Cautions with other medicines
There are no known problems mixing lactulose with other medicines or herbal remedies.
Taking lactulose with other laxativesFor most people, 1 laxative will be enough to relieve constipation.
Occasionally, you may need to take 2 different types of laxatives at the same time to get your bowels moving again.
Only take 2 laxatives together on the advice of your doctor or pharmacist, as there's an increased risk of side effects.
Meds New IA (H2) - Cautions with other medicines alert
Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.
View the original NHS website page ↗. Refreshed 19 August 2026.
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