Have you or someone in your family been prescribed a blood thinner by a doctor? You may have heard of "blood thinners." These medications don't actually thin the blood, they just control the clotting process. Today we're talking about a very important, relatively new class of medications called Factor Xa Inhibitors.
Simply put, what are these Factor Xa Inhibitors?
Factor Xa Inhibitors are a type of medication that prevents our blood from clotting too much. Doctors call them ``Direct Oral Anticoagulants - DOACs''. Simply put, these are medications that prevent blood clotting. They are used to treat a blood clot that has already formed, as well as as a long-term treatment to prevent future blood clots.
There are several main types of medications that belong to this category.
| Drug Name | Special points |
|---|---|
| Apixaban | A commonly used type. |
| Rivaroxaban | Another commonly used type. |
| Edoxaban | Used on medical advice. |
| Fondaparinux | This is not a pill, but an injection given intravenously. |
What kind of medical conditions are these used for?
These medications may be prescribed for a variety of reasons, mainly:
- Reduce the risk of stroke: Especially for those with atrial fibrillation, an irregular heartbeat in the atria of the heart.
- Reduce the risk of blood clots in the veins (Venous Thrombosis).
- Reduce the risk of cardiovascular events in people with heart and blood vessel diseases, such as coronary artery disease and peripheral artery disease.
- Treat blood clots in deep veins (Deep Vein Thrombosis - DVT). This usually occurs in the legs.
- Treat blood clots in the lungs (Pulmonary Embolism - PE).
- Treat venous thromboembolism (VTE).
Who should take this medicine?
Some people take these medications because they already have a blood clot. For others, doctors prescribe them as a preventative measure because they are at risk of developing blood clots.
Imagine someone has had a total hip replacement. After the surgery, you have to stay in bed for a while, so the blood flow in the veins in your legs is reduced, increasing the risk of blood clots. That's when doctors prescribe these medications. They're also given after knee replacements.
What is the difference between Warfarin, an old drug, and this new drug?
Before the advent of Factor Xa Inhibitors, the most commonly used drug to prevent blood clots was ``Warfarin.`` Warfarin is a very effective drug that has been used for many years.
But here's the main difference : A person taking Warfarin needs to have regular blood tests (INR tests) to make sure the dose of the medication is working properly. This test may be done twice a week, or once a month.
But someone taking Factor Xa Inhibitors usually doesn't need to have these frequent blood tests. It's enough to take the prescribed dose daily. This is a great convenience for patients.
How does this medicine work in the body?
This is very easy to understand. Think of the process of forming a blood clot in our body as an assembly line in a factory. There are many steps that are interconnected.
"Factor Xa" is a very important worker in this production line. Without it, we can't go to the next step. So, what we do with this Factor Xa Inhibitor drug is to stop that worker (that's the protein) called "Factor Xa" from working. Then the production line stops halfway, which means the blood clot stops forming. Very simple, right?
How long do I need to take this medicine?
The reason you are prescribed this medicine will determine how long you need to take it. Your doctor will explain this to you. This is usually how long it will take.
| Condition/Cause | Average time to take medication |
|---|---|
| Irregular heartbeat (Atrial Fibrillation) | Often throughout life. |
| Blood clots in the veins (VTE) | 3 to 6 months. |
| A blood clot in the leg (DVT) or lung (PE) | About 6 months. |
| After knee replacement surgery | About 12 days. |
| After hip replacement surgery | About 35 days. |
What are the main risks and side effects?
The main risk with these medications is excessive bleeding . This is normal, because the whole point of these medications is to stop blood clotting. This means that even a small injury can cause a little more bleeding than normal. The most dangerous risk is bleeding inside the brain or in the digestive tract.
The most important thing is to be as careful as possible to avoid accidents and injuries when using this medicine.
Other side effects include:
- Easy bruising (bruising) on the body.
- Skin rash.
Although there are special medications like `(Andexanet Alfa)` that can reverse the effects of these drugs, they are expensive and may not be available in every hospital. So it is best to be careful.
Things you can do to be careful
- Wear gloves and shoes when working in the garden.
- Be very careful when using sharp objects such as knives and scissors.
- Use an electric razor instead of a bladed razor.
- Be aware of potential slip and fall hazards (e.g. loose rugs) in your home. Reduce the risk of accidents from them.
When to see a doctor immediately
If you experience any of the following symptoms, call your doctor immediately. In some cases, it is important to go to the Emergency Department (ETU) of the nearest hospital .
- Heavy bleeding that cannot be stopped (e.g. from the nose, gums, or a wound).
- A fall or a hard blow to the head (even if there is no external bleeding).
- Severe headache or chest pain.
- Difficulty breathing.
- An unusual rash on the skin.
These medications have freed many people from the hassle of frequent blood tests, like those used by patients taking Warfarin. However, these medications are not suitable for everyone. Therefore, talk to your doctor to decide which medication is best for you. No matter what medication you take, it is important to follow your doctor's instructions exactly and ask for clarification if there is anything you do not understand.
Take-Home Message
- Factor Xa inhibitors are a very important class of drugs that prevent the formation of dangerous blood clots.
- Always take the exact dose, at the exact time, as prescribed by your doctor. Never stop taking the medicine or change the dose on your own.
- A major advantage of this medication is that it does not require frequent blood tests like Warfarin.
- Since the main risk is bleeding, always be careful to avoid injuries.
- In case of unusual bleeding, severe headache, chest pain, or head injury from a fall, seek immediate medical attention or go to the nearest hospital Emergency Department (ETU).
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