Blood-thinning medicines reduce the risk of stroke or dangerous clots, but can increase bleeding during an operation. Whether to continue, pause or adjust them requires an individual plan—not a blanket rule.
Which medicines matter?
Examples include warfarin, apixaban, rivaroxaban, dabigatran, aspirin and clopidogrel. Some patients also use injectable anticoagulants. Tell your team the exact drug, dose and last dose taken.
Why not stop all blood thinners before surgery?
Stopping treatment may increase the risk of stroke, heart attack or recurrent thrombosis, especially after a recent clot or coronary stent. Continuing it may increase surgical bleeding. The balance depends on both risks.
How is the timing decided?
The plan considers the procedure’s bleeding risk, kidney function, the reason for anticoagulation and the drug’s duration of action. Your surgeon, anaesthetist and prescribing clinician may need to agree on the schedule.
Will I need heparin injections while treatment is paused?
Not usually for most patients taking direct oral anticoagulants. Bridging is considered only in selected high-thrombotic-risk circumstances, because it can itself increase bleeding.
What if I have a coronary stent?
Never stop antiplatelet medicines without discussing the stent type, date and cardiac risk with the appropriate team. Elective surgery sometimes needs to be delayed.
When are blood thinners restarted?
Restarting depends on secure haemostasis and postoperative bleeding risk. You should leave hospital with clear written instructions stating which medicine to take and when.
Frequently Asked Questions
Should I stop aspirin myself?
No. Its management depends on why you take it and the planned operation.
What if I accidentally take a dose?
Tell the surgical team immediately; do not conceal it or change the plan yourself.
The key message
Never independently stop or restart an anticoagulant or antiplatelet medicine around surgery. Obtain a documented, personalised plan.
This article provides general patient education and does not replace individual medical assessment, informed consent or advice from your treating team. Treatment decisions depend on your circumstances.
Dr. Alassaf is a leading expert in minimally invasive and bariatric surgery, with extensive experience helping patients overcome obesity and related conditions. Having completed advanced training in Australia and the Middle East, he is known for his compassionate approach and evidence-based surgical care.
Provides comprehensive Upper Gastrointestinal & Weight Loss Surgery across Jordan.
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