Medications
HRT (Hormone Replacement) Before Surgery
Like the combined pill, the estrogen in HRT can slightly raise blood-clot risk around surgery — but it depends a lot on whether you take it as a tablet or through the skin as a patch or gel.
Quick answer
Why it matters
Estrogen taken as a tablet is processed through the liver and modestly increases the blood's tendency to clot. Combined with surgery and reduced movement afterward, that can add to the risk of a deep-vein clot (DVT) or a clot on the lung (PE).
Estrogen absorbed through the skin (patches and gels) largely bypasses that liver effect, so it's associated with much less clot risk and is frequently continued through surgery.
As with the pill, oral estrogen's effect takes around four weeks to settle, so any planned stop is arranged well ahead — balanced against the menopausal symptoms that may return.
Do not stop without instruction
What to ask your doctor
- Do I need to stop my HRT, given I take it as a tablet / patch / gel?
- If I stop, when — and when can I restart afterward?
- If I continue, what clot-prevention will I have?
- What can I do about symptoms if I have to pause it?
Red flags — call your team
Red flags — call your team
- A swollen, painful, warm calf — possible deep-vein clot (DVT)
- Sudden breathlessness or chest pain — possible clot on the lung (PE) — seek emergency care
- Clot risk is highest in the weeks after surgery — keep moving and stay hydrated
References
- Reflects standard perioperative and menopause-care guidance; transdermal (patch/gel) estrogen is generally considered lower-risk for clots than oral. Your surgical team's instruction takes precedence.
Frequently asked questions
Do I need to stop HRT before surgery?
It depends on how you take it and the size of the operation. Tablet HRT with estrogen may be stopped about four weeks before major surgery, or continued with clot-prevention measures. Patch or gel HRT is lower-risk and often continued. Your team will advise based on your HRT type and procedure.
Is patch HRT safer than tablets around surgery?
For clot risk, yes — estrogen through the skin (patches, gels) mostly avoids the liver effect that makes tablet estrogen raise clotting, so transdermal HRT is generally considered lower-risk and is often continued. Tell your team exactly which form you use.
What if my menopause symptoms come back when I stop HRT?
If a stop is needed and symptoms return, mention it to your team — there are non-estrogen options to help in the short term, and you'll restart HRT once it's safe after surgery. You don't have to just put up with it.
When can I restart HRT after surgery?
Usually once you're up, moving normally and past the higher clot-risk window. Your team will give you a specific time for your operation — ask before discharge so you know when to resume.