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Blood thinners — also called anticoagulants — are medicines that help prevent clots from forming in the blood. They’re often prescribed for conditions such as atrial fibrillation, heart valve replacements, or a history of stroke.

While these medicines save lives, they also make it harder for your body to stop bleeding. During surgery, this can lead to more bleeding than expected or slower healing afterward.

Careful planning ensures blood thinner safety, preventing complications like blood clots while also reducing the risk of bleeding problems.

Common Blood Thinners and Their Risks

Several medicines can thin the blood. Each works differently and stays in the body for a different amount of time:

• Apixaban (Eliquis) — Works quickly and usually clears in 24 to 48 hours.
• Clopidogrel (Plavix) — Keeps blood cells from clumping. Often stopped five to seven days before surgery.
• Rivaroxaban (Xarelto) — Similar to apixaban, it’s often stopped one to two days before surgery.
• Warfarin (Coumadin) — Requires regular blood tests (called INR levels) and is usually stopped five days before surgery.

Managing blood thinners before surgery requires a personalized plan. Your provider will consider which medicine you take, your overall health, and the type of surgery you’re undergoing to determine when to stop and restart safely.

When Should You Stop Taking Blood Thinners?

There’s no single answer for every person when it comes to stopping blood thinners before surgery. The timing depends on several factors, and each plays a crucial role in safety:

• Bleeding risk — People who bruise easily or have a history of bleeding may need to stop blood thinners earlier.
• Clotting risk — People with recent blood clots, artificial heart valves, or certain heart conditions may not be able to stop without extra steps, such as bridging therapy.
• Kidney and liver function — These organs clear blood thinners from the body. If you have liver or kidney problems or they’re not working well, the medicine may stay in your system longer.
• Type of blood thinner — Medicines like apixaban or rivaroxaban leave the body within a day or two. Warfarin takes longer and requires blood tests to ensure your INR levels are in a safe range.
• Type of surgery — Some procedures, such as brain, heart, or spinal surgery, carry a higher risk of bleeding and may require stopping blood thinners earlier.

What Is Bridging Therapy?

Sometimes, you can’t stop blood thinners completely without risking clots. In this case, your doctor may use bridging therapy.

Bridging therapy means stopping a long-acting blood thinner (such as warfarin) several days before surgery and switching to a shorter-acting option (such as heparin injections).

You stop taking the shorter medicine closer to the surgery date. This lowers the risk of bleeding but still protects against clots. After surgery, you restart the original medicine.

Not everyone needs bridging therapy. It’s typically reserved for people at high risk of clotting, such as those with mechanical heart valves or a recent history of blood clots.

Bridging therapy is one part of overall blood-thinner safety.

What to Tell Your Surgeon and Anesthesiologist

Being open about your medicines helps your care team plan and avoid problems during surgery. Make sure to share the following details:

• All current medicines — Include prescriptions, over-the-counter (OTC) medications, and supplements.
• Any history of bleeding — Past surgical bleeding, nosebleeds, or easy bruising.
• Any history of clots — Such as stroke, deep vein thrombosis (DVT), or pulmonary embolism.
• Doses and timing — How much you take and when you last took it.

This process, known as medication reconciliation, involves a careful review of all medications you take. It helps your team avoid dangerous interactions and create the safest plan for surgery.

UPMC Surgery Medication Guidelines

Large health systems, including UPMC, publish general preoperative and surgery medication guidelines. These are sample timelines for when to stop or adjust certain drugs. For blood thinners, the UPMC surgery medication guidelines suggest:

• Apixaban and rivaroxaban — Stop one to two days before surgery, depending on kidney function.
• Aspirin — Stop seven days before surgery unless needed for heart protection.
• Clopidogrel — Stop five to seven days before surgery unless otherwise directed.
• Warfarin — Stop about five days before surgery, with INR levels checked before the procedure.

These are only examples — your provider may adjust based on your health and the type of surgery you’re having.

What to Expect the Week Before Surgery

Managing blood thinners is part of a larger pre-op plan. The week before surgery, your care team will walk you through the steps needed to balance bleeding and clotting risks, including:

• Blood tests — Check INR levels if you’re on warfarin to make sure your blood is in a safe range.
• Bridging therapy — Start or stop short-acting blood thinners if you need extra protection from clots.
• Final review — Go over your medication plan with your surgeon, anesthesiologist, or pre-op nurse.
• Medication adjustments — Stop, lower, or change doses of certain medicines as directed.

These steps help lower risks and give your providers the information they need to make surgery as safe as possible.

Practical pre-op tips if you take blood thinners

Preparing for surgery while on blood thinners can feel overwhelming. There are many details to keep track of — when to stop medicines, what to tell your care team, and how to plan for recovery.

Breaking down the process into small, clear steps can make it less stressful and help you feel more confident going into surgery. These steps make it easier:

• Ask for clarity — If timing instructions are unclear, call your provider.
• Bring a list — Write down all medicines you take, including supplements.
• Follow up — Keep all lab appointments, especially INR checks if you take warfarin.
• Plan — Make sure you have enough medicine for after surgery.
• Use reminders — Set phone alarms to remind you when to stop or restart your medicines.

Questions to Ask Your Health Care Provider

You play an essential role in managing blood thinners before surgery. Helpful questions to ask your provider include:

• Are there any foods or supplements I should avoid?
• Do I need bridging therapy?
• How will you check my INR levels?
• When can I safely restart my blood thinner after surgery?
• What should I do if I notice bleeding or bruising before surgery?
• When should I stop my blood thinner before surgery?
• When to stop aspirin before surgery?