Which of your tablets should you stop before surgery, and when? The honest answer is that it depends on the drug, the reason you take it and the operation, and that the decision belongs to the prescriber together with your surgeon and anaesthetist. Stopping the wrong medicine can be more dangerous than the bleeding it was meant to prevent.
What you can do is prepare a complete list and understand the usual patterns, so that you ask the right questions early. Patients travelling for surgery need this conversation weeks ahead, because some medicines are stopped a month before and some need a replacement plan.
Key points
- Never stop a prescribed medicine on your own. Ask the prescriber and the surgical team, and get the plan in writing.
- Blood thinners and antiplatelet drugs need an individual plan. After a heart stent or a clot, stopping them can be life threatening.
- Many supplements affect bleeding or anaesthesia. A common rule is to stop non-essential supplements 2 weeks before surgery.
- Weight loss and diabetes injections of the GLP-1 type slow stomach emptying and need specific instructions before anaesthesia.
- Most heart, blood pressure, thyroid, asthma and seizure medicines are continued, including on the morning of surgery.
Make a complete list first
Write down everything you take, with dose and timing: prescriptions, over the counter painkillers, inhalers, eye drops, creams, hormone treatments, injections, vitamins, herbal products, sports supplements, protein powders with additives and recreational substances. Use generic names where you can, since brands differ between countries. Send this list with your records and carry a copy when you travel.
People often forget items they do not think of as medicines: the contraceptive pill, a daily low dose aspirin, fish oil, a sleep remedy, a weekly injection for weight loss. These are exactly the ones that matter.
Medicines that affect bleeding
These need the most care. The timings shown are typical for elective surgery in mainstream guidance and may be shorter or longer for you. For anyone with a stent, mechanical valve, atrial fibrillation or previous clot, the cardiologist or haematologist must be part of the decision.
- Aspirin: If taken for heart or stroke protection, often continued for many operations or paused about 7 days for procedures with high bleeding risk. Decided case by case.
- Clopidogrel, prasugrel, ticagrelor: Commonly paused 5 to 7 days before, but only with cardiology approval. Elective surgery is usually postponed during the months after a stent.
- Warfarin: Commonly stopped about 5 days before with an INR check. Some patients need bridging injections.
- Apixaban, rivaroxaban, dabigatran, edoxaban: Typically stopped 1 to 3 days before, longer with reduced kidney function or high bleeding risk surgery.
- Ibuprofen, naproxen, diclofenac: Anti-inflammatory painkillers are often stopped about 5 to 7 days before. Paracetamol is the usual alternative.
- Some antidepressants: SSRIs have a mild effect on platelets but are usually continued, because stopping them abruptly causes its own problems.
Supplements and herbal products
Evidence on individual supplements is limited and mixed, and product strength varies widely. Because the benefit of continuing them for 2 weeks is negligible, anaesthetic societies and most surgeons advise stopping non-essential supplements about 2 weeks before surgery. The items below are those most often named.
- Fish oil, high dose vitamin E, garlic tablets, ginkgo, ginseng, ginger and turmeric capsules: may increase bleeding
- St John's wort: interacts with many anaesthetic and pain medicines
- Kava and valerian: may deepen sedation
- Ephedra and some pre-workout or fat burner products: can raise heart rate and blood pressure
- Green tea extract and high dose multi-ingredient slimming products: unpredictable effects on liver and bleeding
- Arnica and bromelain: popular for bruising, but evidence of benefit is weak. Take them only if your surgeon agrees
Hormones, diabetes and weight loss medicines
Combined contraceptive pills and oestrogen hormone therapy raise clot risk. Before major surgery, or surgery followed by reduced mobility and a flight, many surgeons advise stopping them about 4 weeks ahead. This needs an alternative contraceptive plan, since an unplanned pregnancy is a bigger problem than the pill. Progestogen only methods are generally continued. Testosterone and other hormone treatments should be discussed individually.
Diabetes medicines need a written plan. Metformin is often omitted on the day of surgery. SGLT2 inhibitors such as empagliflozin and dapagliflozin are usually stopped about 3 days before because of a risk of ketoacidosis. Insulin doses are adjusted, not stopped. GLP-1 receptor agonists such as semaglutide delay stomach emptying. Guidance on these has been changing, with options ranging from withholding a weekly dose to continuing with a longer clear fluid diet, so ask your anaesthetist what they require.
Medicines that are usually continued
Stopping these can cause harm, and most are taken as normal with a small sip of water on the morning of surgery unless you are told otherwise.
- Beta blockers and most heart rhythm medicines
- Statins for cholesterol
- Thyroid hormone
- Asthma and COPD inhalers, which you should bring to hospital
- Anti-seizure medicines
- Parkinson's disease medicines, which are time critical
- Long term steroids, which must not be stopped suddenly and may need an extra dose around surgery
- Most psychiatric medicines, though lithium, MAO inhibitors and clozapine need specialist advice
Medicines that may be adjusted
ACE inhibitors and angiotensin receptor blockers, such as ramipril or losartan, are often omitted on the morning of surgery because they can cause low blood pressure under anaesthesia. Diuretics are frequently skipped that morning too. Immunosuppressants and biologic drugs for arthritis, psoriasis or bowel disease may be timed so that surgery falls at the end of a dosing cycle, which your specialist should plan. Methotrexate is often continued.
Isotretinoin for acne deserves mention. Many surgeons still ask for a gap of 6 to 12 months before procedures that depend on skin healing, such as laser resurfacing and some rhinoplasty, although recent evidence suggests the risk may be lower than once believed. Follow your surgeon's preference.
Alcohol, recreational drugs and the travel factor
Reduce alcohol in the weeks before surgery and avoid it completely for at least 48 hours before and while taking painkillers afterwards. Heavy drinkers should not stop suddenly without medical advice because of withdrawal risk. Cocaine and amphetamines close to an anaesthetic are dangerous, and the anaesthetist must know.
When you travel, carry medicines in original packaging in hand luggage with a copy of the prescription. Check whether any are controlled at your destination. Bring enough for the whole stay plus a margin for delays, and keep taking your regular medicines through the trip unless instructed otherwise.
Restarting after surgery
Leave hospital with written instructions for each paused medicine: when to restart and at what dose. Blood thinners are typically restarted within 1 to 3 days once bleeding risk has settled, as directed by the surgeon. Anti-inflammatory painkillers may be allowed after a few days for some operations and avoided for longer after others. Supplements can generally wait 2 weeks. Hormonal contraception is usually restarted once you are fully mobile, and you need another method in the meantime.
When to get medical help
Do not stop anticoagulants, antiplatelet drugs, steroids, insulin, anti-seizure or heart medicines without explicit advice from the prescriber. After pausing a blood thinner, seek emergency care for chest pain, breathlessness, a swollen painful leg, sudden weakness, facial droop or speech difficulty. After surgery, seek urgent care for bleeding that soaks dressings, rapidly expanding swelling, black stools or vomiting blood. If instructions from your own doctor and the surgical team conflict, ask them to speak to each other before you change anything.
This guide is general information and does not replace advice from the doctor treating you. If you would like a specialist to look at your own case, send your reports and photographs: a Clinic-Y coordinator replies within 24 hours, and the case review is free.
Frequently Asked Questions
What can I take for pain in the week before surgery?
Paracetamol, within the dose on the packet, is the usual choice because it does not affect bleeding. Avoid ibuprofen, naproxen, aspirin based cold remedies and combination products unless your surgeon has approved them. Check the ingredients of anything bought over the counter.
Should I stop my ordinary multivitamin?
A standard once daily multivitamin at normal doses is unlikely to cause problems, and many surgeons allow it. The concern is high dose single vitamins, especially vitamin E, and multi-ingredient products. When in doubt, stop non-essential products for 2 weeks and restart later.
I forgot to stop a medicine in time. What should I do?
Tell the surgical team immediately and honestly. Depending on the drug and the procedure, they may proceed, add a blood test, change the anaesthetic plan or postpone. A delayed operation is inconvenient when you have travelled, but hiding the mistake is far riskier.
Do I need to stop medicines for procedures under local anaesthesia?
Often fewer changes are needed, but bleeding still matters in hair transplantation, dental extractions, implant surgery and eyelid procedures. Many dental and minor procedures are safely done without stopping blood thinners, using local measures instead. Ask the clinician performing the procedure and never stop a blood thinner for a minor procedure on your own.