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Medicine

Marevan – blood thinner

Tablet

A simple and personal explanation of the medicine for patients and families.

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Overview

Marevan makes it harder for the blood to clot. This can protect against dangerous clots, but it also means bleeding can happen more easily if the dose becomes too strong or if another medicine changes the effect.

Ibrahim's pharmacy advice

I often explain it like this: Marevan works best when it stays in balance. If the effect is too weak, clots may form. If it is too strong, bleeding may happen. So this is not just a tablet you take every day without thinking — it is a treatment that needs respect for the dose, the diet, and the INR checks.

Use

  • Marevan is used to reduce the risk of blood clots.
  • It is used in some people with atrial fibrillation, previous clots, or mechanical heart valves.
  • It works by slowing down the clotting process in the blood.

Dosage and Ibrahim's advice

  • The dose of Marevan is individual and may differ from one person to another.
  • It is often taken once daily, often in the evening, according to your treatment plan.
  • INR blood tests are important to check whether the dose is right.
  • If you miss a dose, follow the advice you were given and do not double the next dose.

Side effects

  • The most important side effect is bleeding or easy bruising.
  • Some people notice nosebleeds or gums that bleed more easily.
  • Tiredness or dizziness may sometimes be linked to small bleeds over time.
  • Contact a doctor if you notice signs of unusual bleeding.

Drug interactions

  • Marevan is affected by many other medicines, so any new treatment should always be mentioned.
  • Painkillers such as ibuprofen and naproxen may increase the risk of bleeding.
  • Antibiotics, antifungals, some antidepressants, and some herbal products may change the INR.
  • Always tell doctors and pharmacists that you use Marevan.

Important warnings

  • Seek help if you get blood in the urine, black stools, vomiting blood, severe headache, or many unusual bruises.
  • Tell your dentist or another doctor about the treatment before any procedure.
  • Speak to a doctor straight away if you are pregnant or planning pregnancy.
  • Do not stop treatment without medical advice.

Ramadan and fasting

  • Fasting is often possible, but changes in diet during Ramadan can affect the INR.
  • Take the medicine at a regular time, for example after iftar, if that fits your plan.
  • Contact your INR clinic if your diet changes clearly.
  • The key is stable habits and continued monitoring.

Food and drink

  • Foods with vitamin K, especially green vegetables, should stay reasonably consistent in your diet.
  • The aim is not to avoid them completely, but to avoid large sudden changes.
  • Avoid heavy alcohol use because it may increase bleeding risk.
  • Ask before starting supplements or herbal products.

Storage

  • Keep in a dry place and out of reach of children.
  • Keep in the original packaging.
  • Do not use after the expiry date.
  • Return leftover medicine to the pharmacy.

Sources

This text is written in a personal and simple style, but the medical information is based on official sources.