Atrial fibrillation and anticoagulants: a practical everyday guide
What you need to know if you take an anticoagulant for atrial fibrillation: types, daily routine, missed doses, interactions, activities and warning signs.
In short
- In atrial fibrillation, clots can form in the heart and travel to the brain; the anticoagulant lowers that stroke risk.
- Take it at the same time every day and do not stop it or change the dose without talking to your doctor.
- Before taking any other medicine, supplement or herbal remedy, ask: anti-inflammatories such as ibuprofen increase the risk of bleeding.
- A blow to the head, a sudden severe headache or blood in vomit or stools need urgent medical attention.
If you have atrial fibrillation and have been prescribed an anticoagulant, the most important things are to take it every day on time, to check before adding any other medicine and to know how to recognise bleeding that needs attention. With those three keys you can carry on with your work, travel and exercise with peace of mind.
This guide is designed for you, as someone who manages their own treatment. It does not replace your doctor's instructions or the leaflet for your specific medicine, which is the reference whenever you are unsure.
Why do you need an anticoagulant if you have atrial fibrillation?
Because the irregular rhythm of atrial fibrillation makes it easier for blood clots to form in the heart, and if one breaks off and reaches the brain it can cause a stroke. Anticoagulants reduce the chance of those clots forming.
In return, they increase the chance of bleeding, which is why not everyone can take them and your doctor decides after assessing your case. Not feeling anything does not mean you do not need it: its effect is preventive, and stopping too early can increase the risk of a clot.
What is the difference between Sintrom and the direct anticoagulants?
There are two main groups. Vitamin K antagonists (acenocoumarol, known in Spain as Sintrom, and warfarin) need regular clotting blood tests (INR) to adjust the dose. Direct oral anticoagulants (apixaban, dabigatran, edoxaban and rivaroxaban) are taken at a fixed dose and do not need that routine monitoring.
| Aspect | Acenocoumarol or warfarin | Direct anticoagulants |
|---|---|---|
| Clotting checks | Regular INR tests; the dose may change after each check | No routine INR; regular reviews with your doctor |
| Dose | Varies according to the check | Fixed, once or twice a day depending on the medicine |
| Diet | Keep your intake of vitamin K rich foods (leafy green vegetables) steady | Generally no specific dietary restrictions |
| Other medicines | Many interactions; always check | Fewer interactions, but there are some; always check |
| If you miss a dose | Follow the leaflet and mention it at your next check | The rule depends on the medicine; follow its leaflet |
How do you fit the anticoagulant into your daily routine?
Always take it at the same time, tied to a fixed moment in your day, and be clear about what to do if you forget one day. Regularity is especially important with this treatment.
- Fixed time: choose a stable moment (breakfast, dinner) and set an alarm with the name of the medicine.
- If you take acenocoumarol or warfarin, write down the daily dose you are given after each check and keep the sheet to hand.
- If you forget a dose, follow the leaflet for your medicine, because the rule varies: for example, the apixaban leaflet gives different instructions depending on whether the morning or evening dose was missed. Never take a double dose to make up for it.
- Always carry the anticoagulant card you were given (some medicines include their own card in the pack) and add it to your medication list.
- When travelling, carry spare medication in your hand luggage and keep the interval between doses when you change time zone, checking with your pharmacist beforehand.
What precautions should you take and which bleeding signs should you watch for?
Always check before taking another medicine, supplement or herbal remedy, and tell any professional (including your dentist) that you take an anticoagulant. Do not stop the anticoagulant before a procedure on your own: your doctor decides whether a pause is needed.
- Painkillers: anti-inflammatories such as ibuprofen and aspirin increase the risk of bleeding. Even paracetamol is listed in the acenocoumarol leaflet as a medicine that can increase its effect, so ask what is right for you.
- Herbal remedies and supplements: some, such as St John's wort, can interfere.
- Alcohol: the acenocoumarol leaflet advises avoiding it; with other anticoagulants, ask your doctor.
- Activities: your doctor may advise you to avoid contact sports. Use a soft toothbrush, an electric razor and gloves for jobs with a risk of cuts. If you exercise, read precautions when exercising on medication.
| Sign | What to do |
|---|---|
| A blow to the head, even if you feel fine | Urgent medical attention |
| Sudden severe headache, confusion or difficulty speaking | Call 112 |
| Vomiting blood, coughing up blood or black or bloody stools | Urgent medical attention |
| Bleeding that will not stop (nose, wound) | Urgent medical attention |
| Unexplained bruises, bleeding gums, pink urine or very heavy periods | See your doctor soon |
If you would like a version designed to share with your family, see our article on what the family of someone on anticoagulants should know.
A practical example: Antonio gets back on his bike
Let us take the case of Antonio, 64, a working engineer who has just been diagnosed with atrial fibrillation. His cardiologist has prescribed a direct anticoagulant taken twice a day. He often travels for work and goes cycling at weekends.
- He links the doses to breakfast and dinner and sets two alarms with the name of the medicine.
- He reads in the leaflet what to do if he misses a dose and takes a photo of that section.
- He keeps the anticoagulant card next to his ID card and adds the treatment to the list on his phone.
- He asks his cardiologist about cycling: she advises always wearing a helmet and seeking advice if he falls and hits his head.
- For his back pain, he stops buying ibuprofen on his own and asks his pharmacist what he can take.
How can IMA Health help you?
With IMA Health, a specialised pharmacy prepares your medication by the day and time of each dose, which helps you neither forget nor double your anticoagulant. The pharmacist assesses which medicines can go into this system (some, such as dabigatran capsules, must be kept in their original packaging) and, if your dose changes after a check, the preparation has to be updated. IMA coordinates with the pharmacy, delivers your medication to your home and provides personalised follow-up.
Sources
- AEMPS, CIMA: Sintrom 4 mg (acenocoumarol) leaflet (in Spanish)
- AEMPS, CIMA: Eliquis 5 mg (apixaban) leaflet (in Spanish)
- MedlinePlus: Atrial fibrillation and atrial flutter (in Spanish)
- MedlinePlus: Taking warfarin (in Spanish)
- NHS: Anticoagulant medicines, considerations
This article is for information only and does not replace advice from your doctor or pharmacist.