Deep vein thrombosis treatment has three goals: stop the clot growing, prevent a piece breaking off and reaching the lungs, and reduce the chance of another clot. For most people this means taking blood-thinning medicine for a number of months. This page explains the options in plain English. It does not give doses, because the right medicine and plan depend on you, and only your treating doctor can decide them. To understand the condition first, read our guide to deep vein thrombosis.
Deep vein thrombosis treatments at a glance
| Option | What it does | When it’s used |
|---|---|---|
| Anticoagulants (blood thinners) | Stop the clot growing and new clots forming | Almost everyone with a confirmed DVT |
| Clot-dissolving therapy (thrombolysis) | Breaks down the clot | Selected severe or extensive clots |
| Clot removal procedures | Remove or open a blocked vein | Selected cases, often in specialist centres |
| Vein filter | Catches clots before the lungs | Only if blood thinners cannot be used |
| Supportive care | Walking, leg elevation, pain relief | Alongside the above |
Blood thinners for deep vein thrombosis
Blood thinners for deep vein thrombosis are the foundation of treatment. The name is misleading: they do not thin the blood in the sense of making it watery. They interrupt the clotting process, so a clot cannot grow while the body slowly dissolves it.
Doctors usually start treatment quickly, sometimes before the scan result if clinical suspicion is high and the scan will be delayed. Treatment is often begun in an emergency department or clinic, and many people go home the same day.
Deep vein thrombosis anticoagulation: the main types
Deep vein thrombosis anticoagulation can use several medicine groups. Your doctor chooses based on your kidney and liver function, other medicines, pregnancy, cancer, body weight and personal preference.
- Direct oral anticoagulants (DOACs). Tablets such as apixaban or rivaroxaban. Current NICE guidance supports DOACs as a first choice for most people because they are taken by mouth and need little monitoring.
- Low molecular weight heparin. Given by injection under the skin. Often used at the start, in pregnancy and in some people with cancer.
- Warfarin. An older tablet that needs regular blood tests to check how well it is working. It may be used when other options are unsuitable.
This page does not discuss doses or switching between medicines. Never change or stop your anticoagulant without speaking to the doctor or pharmacist who prescribes it.
Deep vein thrombosis medication: how long will I need it?
The usual minimum is three months. After that, your doctor reviews whether to continue. The decision depends on why the clot happened:
- Provoked by a clear temporary trigger, such as surgery or injury: treatment often stops after about three months.
- Unprovoked, with no clear cause, or linked to a lasting risk such as active cancer: longer treatment may be offered, balancing the risk of another clot against the risk of bleeding.
- Recurrent clots: longer treatment is more common.
NICE advises against routine tests for inherited clotting conditions in most people, because they rarely change the treatment plan.
Treatment for blood clot in leg: other procedures
Most people never need more than treatment for blood clot in leg with anticoagulants. A few situations call for more:
- Clot-dissolving drugs or catheter-based clot removal. Considered for a very large clot, usually higher in the leg or pelvis, that threatens the limb or causes severe symptoms, and for selected younger patients. These carry a higher bleeding risk and are done in specialist hospitals.
- Vein stenting. If a narrowed vein, such as in May-Thurner syndrome, contributes to the clot, a stent may be considered after the clot is treated.
- Inferior vena cava (IVC) filter. A small device placed in the large vein to catch clots. It is reserved for people who cannot take anticoagulants or who still develop clots despite them. It is not a substitute for medicine.
Side effects and safety
The main risk of blood thinners is bleeding. Tell your doctor or go to hospital promptly if you have:
- Bleeding that does not stop after ten minutes of firm pressure
- Black, tarry or bloody stools, or blood in the urine
- Vomiting blood or what looks like coffee grounds
- Unusually heavy periods
- A head injury or a bad fall, even if you feel fine
- Severe headache, confusion or weakness on one side of the body
Other points for daily life:
- Tell every doctor, dentist and pharmacist that you take an anticoagulant.
- Check before using other medicines or supplements, including pain relievers such as aspirin or ibuprofen and herbal products, because some interact.
- Do not skip doses. Missing tablets increases your clot risk.
- Pregnancy needs specialist planning, because some tablets are not suitable.
Recovery and aftercare
Early walking is encouraged once pain allows, as staying active does not raise the risk of the clot moving. Elevating the leg when resting can ease swelling. Pain usually improves over days to weeks. Some people develop long-term swelling, heaviness or skin changes known as post-thrombotic syndrome. Compression stockings are not routinely advised to prevent it, according to NICE, but they may help symptoms in some people, so ask your doctor.
Follow-up appointments are important: your doctor will review the cause, your bleeding risk and whether to continue treatment. Recovery of the leg can take months.
When to see a doctor
Call 995 immediately for sudden chest pain, sudden breathlessness, coughing up blood, fainting or a racing heartbeat. These may be signs of a pulmonary embolism.
Seek urgent medical help if you have a new swollen, painful, warm or discoloured leg, if your symptoms worsen on treatment, or if you have any heavy or unusual bleeding, black stools, a head injury or severe headache while taking blood thinners.
Arrange a review with your doctor if you have persistent swelling, aching or skin changes in the leg months after a clot, or questions about how long to continue treatment. A vascular or vein specialist can assess long-term leg problems; see find a vein specialist. If you are also bothered by visible veins, our treatments compared guide explains the options for varicose veins, which are a separate condition. The glossary explains medical terms.
This page is educational and does not replace advice from your treating doctor.
Frequently asked questions
Do blood thinners dissolve a clot?
Not directly. They prevent the clot from growing and stop new ones forming, which gives your body's own clot-clearing system time to work. This is why the treatment course lasts months rather than days.
Do I need to stay in hospital for a DVT?
Often not. Many people with an uncomplicated leg DVT are treated at home with tablets or injections after assessment. Hospital care is used when someone is very unwell, has a large clot, has a pulmonary embolism or has other medical problems.
Should I wear compression stockings after a DVT?
NICE advises against routinely offering compression stockings to prevent post-thrombotic syndrome after a DVT. They may still be used for symptom relief in some people, so discuss it with your doctor.
Can I exercise or travel while on treatment?
Walking and normal activity are usually encouraged once pain allows. Plans for sport, long-haul travel or surgery should be discussed with your treating doctor first.
Sources and further reading
This article is general information, not personal medical advice. Please speak to a doctor about your own symptoms. How we create our content.
