Medications
Birth Control Before Surgery
Whether you stop the contraceptive pill before surgery depends on which pill you take and how big the operation is. The estrogen-containing combined pill is the one that can raise clot risk; the progestogen-only mini-pill usually isn't a concern.
Quick answer
Why it matters
Estrogen makes the blood slightly more likely to clot. Surgery — especially bigger operations and being less mobile afterward — also raises clot risk, so the two together can add up to a meaningful risk of a deep-vein clot (DVT) or a clot on the lung (PE).
It takes around four weeks after stopping the combined pill for that extra clot risk to settle, which is why the stop (when advised) is planned well ahead rather than a day or two before.
The decision balances clot risk against the real risk of an unplanned pregnancy — so it's made with you, and always with a plan for alternative contraception.
Do not stop without instruction
What to ask your doctor
- Do I need to stop my combined pill, and exactly when?
- What contraception should I use during the gap?
- When is it safe to restart after surgery?
- I'm on the mini-pill or an implant/coil — does that change anything?
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
- These risks are highest in the weeks after surgery, so keep moving and stay hydrated
References
- Reflects standard perioperative and sexual-health (e.g. FSRH) guidance; your surgical team's instruction takes precedence.
- Progestogen-only methods (mini-pill, implant, hormonal coil, injection) are not generally associated with the same surgical clot risk as combined estrogen methods.
Frequently asked questions
Do I have to stop my birth control pill before surgery?
Only the combined (estrogen) pill, and usually only for bigger or longer operations — then it's often stopped about four weeks before. The progestogen-only mini-pill is generally fine to continue. For minor day surgery, the combined pill is frequently continued with simple clot-prevention measures. Your team will tell you what applies to you.
What's the difference between the combined pill and the mini-pill here?
The combined pill contains estrogen, which is what slightly raises blood-clot risk around surgery. The progestogen-only mini-pill (and implants, hormonal coils and injections) don't carry that same surgical clot concern, so they're usually continued. If you're not sure which you take, your pharmacy or GP can confirm.
If I stop the pill, how do I avoid getting pregnant?
Use a reliable alternative such as condoms throughout the time you're off the pill and until you're told it's safe to restart. Don't rely on the stopped pill still working — plan the alternative in advance so you're covered.
When can I restart my pill after surgery?
Usually once you're up, moving normally and the higher clot-risk period has passed — your team will give you a specific time based on your operation and recovery. Ask before you leave hospital so you're clear on when to resume.