Which Medications Should Be Stopped Before Surgery?

Before surgery, certain medications and supplements are temporarily stopped because they raise bleeding risk, but that decision can only be made jointly by your surgeon and the doctor who prescribed the medication. The groups most often reviewed are blood thinners, aspirin, certain herbal supplements and hormonal medications. You should never stop any medication on your own without consulting your doctor.

Why are some medications stopped before surgery?

During surgery, tissue is cut and blood vessels are damaged, so the body's natural clotting mechanism needs to work properly to stop bleeding. Any substance that weakens clotting can raise the risk of excessive bleeding, extensive bruising, and in rare cases a complication requiring a repeat procedure, both during and after surgery. Some medications, on the other hand, affect blood pressure and heart rhythm, creating different risks during anesthesia, so your doctor needs to know the complete list of everything you take, including over-the-counter drugs.

When preparing for your consultation, it helps to bring a full written list of medications rather than just package names — the name of the drug and why you take it, not the dose. Many patients leave out their daily headache pill or cold medicine, treating it as an "ordinary drug," even though the pseudoephedrine in some cold remedies raises blood pressure and needs to be accounted for during anesthesia.

Blood thinners and aspirin

This is the best-known group that raises bleeding risk:

• Aspirin and aspirin-containing painkillers
• Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen
• Prescription anticoagulants such as warfarin
• Platelet-function-reducing drugs such as clopidogrel

For most of these medications, stopping at least 7-10 days before surgery is usually recommended, but this depends on the specific drug and the decision of the prescribing doctor. NEVER stop a prescription anticoagulant taken for a cardiovascular condition on your own — doing so can lead to serious outcomes such as a stroke or heart attack. Whether to stop this medication should be decided jointly by the prescribing doctor and your surgeon.

Herbal supplements and vitamins

Even though they are considered "natural," many herbal supplements affect blood clotting, and this is often overlooked by patients:

• High-dose vitamin E
• Fish oil and Omega-3 supplements
• Garlic-concentrate supplements
• Ginkgo biloba
• Ginseng-based supplements

For most of these supplements, stopping 1-2 weeks before surgery is common practice. During your consultation, tell your surgeon about every vitamin and supplement you use, even the ones you consider "natural."

Being "natural" does not mean a substance does not raise bleeding risk — discuss every supplement with your doctor.

Hormonal medications and birth control

Estrogen-containing birth control pills and some hormone-replacement therapies can raise the risk of blood clots forming, especially after surgeries that require prolonged immobility. This risk is also factored into anesthesia safety assessments. Estrogen raises the level of certain clotting factors in the blood, while surgery itself creates a similar risk due to immobility — the overlap of these two factors raises the likelihood of a clot forming in small vessels. Whether to stop these medications depends on individual risk assessment and is decided by your surgeon together with a gynecologist or family doctor.

Why is stopping medications on your own dangerous?

There are drug groups unrelated to bleeding that still need discussion before surgery. For example, some diabetes medications are taken differently on the morning of anesthesia, since a fasting period can cause an unpredictable drop in blood sugar. Some blood pressure medications may also be adjusted on the morning of surgery to prevent blood pressure from dropping too much during the procedure. All of these details are individual and should be planned only by your medical team.

Stopping medications prescribed for a chronic condition (for example, heart rhythm, epilepsy or psychiatric medications) on your own out of fear of surgery can trigger a flare-up of the underlying condition. In some cases, abruptly stopping a medication itself causes a serious complication — for example, abruptly stopping certain heart medications can cause a rhythm disturbance, while stopping certain antidepressants can cause "discontinuation syndrome." The right approach is to bring a full list of your medications to the consultation and discuss each one individually. Other steps of this process are explained in the pre-surgery preparation article. When procedures involve more extensive tissue trauma, such as liposuction or abdominoplasty, reviewing your medication list becomes even more important.

When to see a doctor

Contact your doctor immediately, before or after surgery, in the following situations:

• You forgot to take a medication and your surgery date is approaching
• You have started taking a new medication or supplement
• You notice unusually heavy bruising or bleeding
• You develop dizziness, unusual shortness of breath or chest pain
• A fever above 38 degrees or unusual swelling

Frequently asked questions

If I take aspirin daily, should I mention it at the consultation?

Yes, absolutely. Even though aspirin is sold over the counter, it is one of the most important medications your surgeon needs to know about.

Do I need to stop all herbal supplements?

Not all of them, but each one needs to be discussed individually — some supplements do not affect bleeding risk, and others do. If unsure, bring the supplement's package or name to the consultation so your doctor can decide more precisely.

If my doctor did not say to stop a prescription drug, should I stop it myself?

No. Only act on your doctor's instructions, and never stop a prescription medication on your own initiative.

When can I go back to my medications after surgery?

This depends on the type of medication and how the surgery goes, and your surgeon will give you an individual recommendation. Chronic-condition medications are usually resumed right after surgery with the surgeon's approval, while medications carrying bleeding risk may be delayed until wound healing reaches a certain stage.

This article is for information only and does not replace a medical consultation.