Drug interactions
Bismuth subsalicylate + Warfarin
Severity: Major
Bismuth subsalicylate and Warfarin: major 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
Bismuth subsalicylate releases salicylate, which can increase bleeding risk through antiplatelet effects and possible displacement of warfarin from protein binding. High or prolonged doses carry the greatest risk, and gastric irritation may add to bleeding.
What this interaction means in plain words
Bismuth subsalicylate and Warfarin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Bismuth subsalicylate belongs to Gastrointestinal Tract; Warfarin belongs to Cardiovascular.
Why it happens
Salicylate impairs platelet function, may cause GI mucosal injury and can potentiate warfarin's anticoagulant effect.
What to do
Avoid regular or high-dose use; if short-term use is necessary, monitor INR and watch for bleeding. Consider an alternative antidiarrheal or antacid.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Bismuth subsalicylate
- Bismuth subsalicylate + Dichlorphenamide Major
- Acetylsalicylic acid + Bismuth subsalicylate Moderate
- Amlodipine-benazepril + Bismuth subsalicylate Moderate
- Aspirin / citric acid / sodium bicarbonate + Bismuth subsalicylate Moderate
- Aspirin rectal + Bismuth subsalicylate Moderate
- Aspirin + Bismuth subsalicylate Moderate
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 Bismuth subsalicylate with Warfarin?
MediHelp rates the interaction as major. Bismuth subsalicylate and Warfarin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Bismuth subsalicylate releases salicylate, which can increase bleeding risk through antiplatelet effects and possible displacement of warfarin from protein binding. High or prolonged doses carry the greatest risk, and gastric irritation may add to bleeding.
How serious is the interaction between Bismuth subsalicylate and Warfarin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid regular or high-dose use; if short-term use is necessary, monitor INR and watch for bleeding. Consider an alternative antidiarrheal or antacid.
What other medicines interact with Bismuth subsalicylate?
MediHelp also lists interactions of Bismuth subsalicylate with, for example, Dichlorphenamide, Acetylsalicylic acid, Amlodipine-benazepril. The full list is on the Bismuth subsalicylate page.
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