Varicose Vein FAQ · Medicines
Blood Thinners and Varicose Vein Treatment
Quick answer: Taking a blood thinner does not automatically rule out varicose vein treatment. Many patients on anticoagulants or antiplatelet medicines can have needle-based treatment such as EVLT or sclerotherapy after their doctors review the reason for the medicine. Never stop or change a blood thinner yourself; tell the vein clinic exactly what you take and why.
Key facts at a glance
- Anticoagulants: medicines such as warfarin, apixaban, rivaroxaban, edoxaban and dabigatran that slow clotting.
- Antiplatelets: medicines such as aspirin and clopidogrel that stop platelets sticking together.
- Golden rule: do not stop a blood thinner without the doctor who prescribed it.
- Why it matters: blood thinners raise bruising risk; stopping them can raise stroke or clot risk.
- Needle-based methods: EVLT and sclerotherapy involve no incision, which helps limit bleeding.
- Bring: medicine names, doses, the reason you take them and recent blood test results (e.g. INR).
What counts as a blood thinner?
"Blood thinner" is an everyday term for medicines that reduce the blood's ability to clot. There are two main groups:
- Anticoagulants act on clotting proteins. Examples include warfarin and the newer direct oral anticoagulants (DOACs) such as apixaban, rivaroxaban, edoxaban and dabigatran, as well as injected heparins. They are often prescribed for atrial fibrillation, after a deep vein thrombosis or pulmonary embolism, or with mechanical heart valves.
- Antiplatelet medicines stop platelets from clumping. Examples include aspirin, clopidogrel and ticagrelor. They are often prescribed after a heart attack, stent or stroke.
Some supplements, such as fish oil, ginkgo and high-dose vitamin E, may also affect bleeding. Mention them too.
Can I have varicose vein treatment while on blood thinners?
Often, yes. Modern treatments are carried out through a needle rather than an open incision, which keeps bleeding risk lower than with traditional stripping surgery:
- EVLT seals the vein from the inside using laser heat, which closes it as it is treated.
- Foam sclerotherapy and liquid sclerotherapy use fine needles only.
The decision is made case by case. The vein doctor weighs the benefit of treating your veins against your reason for taking the medicine. In some cases treatment continues on the medicine; in others the prescribing doctor may adjust timing. Only your doctors can make that call.
Why should I never stop my blood thinner myself?
Blood thinners are usually prescribed to prevent something serious: a stroke, a heart attack, a clot in a stent, or a repeat deep vein clot. Stopping suddenly, even for a few days, can raise those risks. If any change is needed, it should be planned between your vein doctor and the doctor who prescribed the medicine.
How does LEDAS plan treatment for patients on blood thinners?
- Medicine review at consultation: the doctor asks what you take, the dose, why, and who prescribed it.
- Ultrasound mapping: a standing duplex ultrasound checks your veins and looks for any existing clot.
- Treatment choice: the method and extent are matched to your veins and medical risk. Sometimes treatment is staged to keep each session smaller.
- Pre-treatment checks: on treatment day, an ECG and pre-treatment ultrasound are part of the routine.
- Aftercare: walking, compression stockings and follow-up ultrasound support healing.
International patients should send their medicine list and any recent blood test results during the online consultation , so planning can start before travel.
What should I expect after treatment?
More bruising
People on blood thinners often bruise more along the treated vein. This usually fades over a few weeks. Compression helps.
Puncture sites
Small needle sites may ooze a little longer. Gentle pressure and the stocking normally control this.
Warning signs
Contact the clinic if bruising keeps spreading or a firm, painful swelling develops. Seek emergency care for heavy bleeding that will not stop with firm pressure, black stools, vomiting blood, sudden severe headache, sudden one-leg swelling, chest pain or breathlessness.
Do some people take a blood thinner because of their veins?
Yes. After a deep vein thrombosis , an anticoagulant is usually prescribed for a period. Vein treatment may then be delayed until the clot has been treated and the deep veins assessed. Patients with KT syndrome and undeveloped deep veins may also be managed conservatively with anticoagulants.
Blood thinners: what to tell the vein clinic
| Medicine type | Examples | What to share |
|---|---|---|
| Vitamin K antagonist | Warfarin | Dose, reason, latest INR result |
| Direct oral anticoagulant (DOAC) | Apixaban, rivaroxaban, edoxaban, dabigatran | Dose, timing, reason, kidney function if known |
| Injected anticoagulant | Heparin, low-molecular-weight heparin | Dose, reason, planned duration |
| Antiplatelet | Aspirin, clopidogrel, ticagrelor | Reason (e.g. stent), date of stent if any |
| Supplements | Fish oil, ginkgo, high-dose vitamin E | Name and dose |
Blood thinners and vein treatment – frequently asked questions
Should I stop aspirin before sclerotherapy?
Do not stop it on your own. Aspirin is often prescribed to protect the heart or brain, and stopping it can carry risk. Tell the vein doctor why you take it; they will decide with your prescribing doctor whether any change is needed. Often, sclerotherapy can proceed without stopping.
Will I bruise more if I take blood thinners?
Usually, yes. Bruising along treated veins tends to be more noticeable and may take a little longer to fade. Wearing compression stockings as instructed and walking daily help. Contact the clinic if a bruise keeps growing or becomes a firm, painful lump.
Can I be treated soon after a deep vein thrombosis?
Usually treatment is delayed until the clot has been treated and the deep veins have been assessed by ultrasound. Treating superficial veins while a deep clot is active is generally avoided. Your vein doctor will advise on timing. See DVT and varicose veins.
Do I need a blood test before treatment?
If you take warfarin, a recent INR result is useful. For other medicines, your doctor will tell you whether any tests are needed. Bring any recent results with you, or send them in advance if you are travelling to Busan from abroad.
About this page
Clinical information:
LEDAS Varicose Vein Clinic, led by
Dr. Kim Byoung Joon , thoracic and cardiovascular surgeon, founding member of the Korean Society for Phlebology.
Medical reviewer:
Dr. Kim Byoung Joon ·
Review status:
Pending ·
Last updated:
October 2026
This page is general information and not a diagnosis. Treatment is decided only after an in-person examination. Read our
editorial policy .
Related: Varicose veins & diabetes · Side effects & risks · Treatment planning · Older adults · What to bring
Send us your medicine list for a safe treatment plan
English consultation available · +82-70-4895-5086 · kbjledaspm@gmail.com
