Acenocoumarol – an anticoagulant (Sinthrome)

Acenocoumarol is an anticoagulant medication prescribed to treat existing blood clots or prevent new ones in at-risk patients. It is particularly used for conditions like atrial fibrillation, heart valve replacements, deep vein thrombosis, and pulmonary embolism.

About acenocoumarol

Type of medicine	An anticoagulant
Used for	Prevention and treatment of harmful blood clots
Also called	Sinthrome®
Available as	Tablets

Acenocoumarol belongs to a group of medicines known as

anticoagulants

, which ‘thin the blood’ by prolonging the time it takes for blood to clot. It achieves this by inhibiting the action of vitamin K, essential for producing clotting factors II, VII, IX, and X in the liver. This reduces prothrombin levels and thrombin generation, thereby decreasing clot thrombogenicity.

Clinically, acenocoumarol is indicated for preventing thromboembolic events such as cerebral embolism, deep vein thrombosis (DVT), pulmonary embolism (PE), post-infarction thromboembolism, and transient ischemic attacks. It treats DVT and myocardial infarction by preventing clot progression in vessels of the legs, lungs, or heart. While warfarin is the preferred vitamin K antagonist (VKA), acenocoumarol serves as an alternative for patients intolerant to warfarin or unsuitable for direct oral anticoagulants (DOACs).

Treatment duration varies: typically 6 weeks to 3 months for acute events, but long-term use is common for chronic risks like atrial fibrillation.

Before taking acenocoumarol

Inform your doctor if any of the following apply, as they may contraindicate acenocoumarol use:

• You are pregnant or breastfeeding, as it can harm the fetus or pass into breast milk.
• You have bleeding disorders, recent major surgery, or conditions like stomach ulcers, recent stroke, or pericarditis.
• You suffer from severe liver or kidney impairment.
• You have uncontrolled hypertension or pass blood in urine/stool.
• You are allergic to acenocoumarol or other coumarins like warfarin.

Additionally, disclose all medications, supplements, and herbal remedies, especially amiodarone, aspirin, NSAIDs (e.g., ibuprofen), or antibiotics, as they interact by potentiating anticoagulant effects and increasing bleeding risk.

How to take acenocoumarol

Take acenocoumarol

once daily

at the same time each day to maintain steady blood levels. Swallow tablets whole with water; your doctor or clinic will specify the dose (often starting 2-4 mg daily for 2 days, adjusted per INR).

If you forget a dose: Take it same-day if remembered; skip if next day and resume schedule. Inform your clinic at next blood test.

Do not stop abruptly without medical advice. For surgery/dental work, show your Anticoagulant Alert Card; you may pause tablets and switch to injections.

Getting the most from your treatment

Receive a yellow ‘Oral Anticoagulant Therapy’ booklet and carry an Anticoagulant Alert Card at all times for emergencies.

Blood monitoring

Regular INR tests measure clotting time (target usually 2.0-3.5, depending on indication). Initial frequent tests stabilize dosing; frequency reduces over time. Dose adjustments ensure balance: not too thin (bleeding risk) or thick (clot risk).

Diet and lifestyle

• Maintain consistent

  vitamin K

  intake (leafy greens); sudden changes affect INR. Avoid cranberry juice.
• Limit alcohol; avoid excessive intake.
• Use paracetamol for pain; avoid aspirin/NSAIDs unless prescribed.
• Report new medications promptly; test INR 5-7 days after changes.

Travel and activities

Carry extra tablets and card when traveling. For injuries or procedures, inform providers.

Possible side effects

Bleeding is the primary risk (80% cutaneous, 52% hematuria); monitor for:

• Bruising, nosebleeds >10 min, blood in urine/stool, heavy periods.
• Severe: vomiting/coughing blood, black stools, dizziness, severe headache, rash.

Rare: hair loss, rash, liver issues. Seek immediate help for major bleeds or head injuries.

About diet when taking acenocoumarol

Vitamin K-rich foods (kale, spinach) antagonize effects; consistency prevents INR fluctuations. No total avoidance needed, but discuss major diet shifts. Avoid cranberry products.

High Vitamin K Foods (Moderate Daily)	Low Vitamin K Foods (Safe Freely)
Spinach, broccoli, Brussels sprouts	Fruits, dairy, meats, rice
Green tea, avocados	Potatoes, carrots, eggs

Health matters when taking acenocoumarol

• Pregnancy/breastfeeding: Contraindicated; use contraception.
• Driving: Safe unless bleeding/dizziness.
• Alcohol: Minimal; excess raises bleeding risk.
• Medical/dental: Always disclose.

Frequently Asked Questions (FAQs)

Q: How long does treatment last?

Typically 6 weeks to 3 months, or lifelong for high-risk conditions like atrial fibrillation.

Q: What if I miss a dose?

Take same-day if possible; skip otherwise and resume. Report at next test.

Q: Can I eat green vegetables?

Yes, consistently; avoid sudden increases.

Q: What painkillers are safe?

Paracetamol; avoid aspirin/ibuprofen.

Q: When to seek urgent help?

Bleeding, bruising, dizziness, head injury, blood in urine/stool.