Drug interactions
Lactulose + Warfarin
Severity: Minor
Lactulose and Warfarin: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Case reports suggest that changes in INR may occur when lactulose is used with warfarin, possibly via diarrhea or altered gut flora affecting vitamin K. The evidence is limited and the relationship is not firmly established.
What this interaction means in plain words
Lactulose and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Lactulose belongs to Gastrointestinal Tract; Warfarin belongs to Cardiovascular.
Why it happens
Mechanism is not established; altered vitamin K availability from diarrhea or gut flora changes has been proposed.
What to do
Check INR when starting, stopping, or changing the dose of lactulose, especially if diarrhea occurs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Lactulose and Warfarin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Lactulose
Other interactions of Warfarin
- Defibrotide + Warfarin Contraindicated
- Ketorolac + Warfarin Contraindicated
- Abciximab + Warfarin Major
- Acetylsalicylic acid + Warfarin Major
- Adagrasib + Warfarin Major
- Amiodarone + Warfarin Major
Frequently asked questions
Can I take Lactulose with Warfarin?
MediHelp rates the interaction as minor. Lactulose and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Case reports suggest that changes in INR may occur when lactulose is used with warfarin, possibly via diarrhea or altered gut flora affecting vitamin K. The evidence is limited and the relationship is not firmly established.
How serious is the interaction between Lactulose and Warfarin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check INR when starting, stopping, or changing the dose of lactulose, especially if diarrhea occurs.
What other medicines interact with Lactulose?
MediHelp also lists interactions of Lactulose with, for example, Deflazacort, Dichlorphenamide, Aluminum hydroxide. The full list is on the Lactulose page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
