Anticoagulant Therapy: Safety, Information and Alert Cards

Anticoagulants are medicines that help prevent blood clots. They are often called blood thinners, although they do not actually make your blood thinner. Instead, they increase the time it takes for your blood to clot.

While these medicines are vital for preventing serious conditions like strokes and heart attacks, they also introduce specific safety risks. Because your blood clots more slowly, even minor injuries can sometimes become serious.

This page provides straightforward information about anticoagulant therapy, how these medicines work, the safety measures you need to take in daily life, and why carrying an alert card is essential.

What are anticoagulants?

Your body naturally forms blood clots to stop bleeding when you cut yourself. However, sometimes clots form inside your blood vessels when they should not. This can block the flow of blood to vital organs, leading to conditions like deep vein thrombosis (DVT), pulmonary embolism (a clot in the lungs), stroke, or heart attack.

Anticoagulants are prescribed to people who have a high risk of developing these dangerous clots.

Common types of anticoagulants

There are several different types of anticoagulant medicines prescribed in the UK. They generally fall into two categories:

Warfarin

This is an older, traditional anticoagulant. If you take warfarin, you need regular blood tests (known as INR tests) to check how quickly your blood clots. Your dose of warfarin may change frequently based on these test results. You also have to be careful about what you eat, as certain foods can affect how the medicine works.

Direct Oral Anticoagulants (DOACs)

These are newer medicines that do not require regular blood tests or strict dietary restrictions. They are taken in fixed daily doses. The most common DOACs include:

• Apixaban (Eliquis)

• Rivaroxaban (Xarelto)

• Edoxaban (Lixiana)

• Dabigatran (Pradaxa)

Your doctor or specialist will decide which medicine is safest and most appropriate for your specific health needs.

Why carrying an anticoagulant alert card is essential

Because anticoagulant medicines slow down your body's ability to stop bleeding, any accident or medical emergency requires immediate and specific care. Carrying an alert card ensures that healthcare professionals are aware of your medication, even if you are unconscious or unable to speak for yourself.

Emergency medical treatment

In a serious emergency, such as a car accident or a severe fall, paramedics and hospital staff need to make quick decisions. If they know you are taking an anticoagulant, they will handle your treatment differently.

For example:

• They will be aware of the increased risk of internal bleeding, particularly in the head or abdomen.

• They can administer specific reversing agents (antidotes) if they are available for your medication, which can help your blood clot normally in a crisis.

• They will avoid certain medical procedures or medications that could worsen bleeding.

If you are unable to tell them about your medicine, precious time can be lost while they run tests to find out why your blood is not clotting.

Dental work and surgeries

If you need a tooth extraction, a minor dental procedure, or any type of surgery, your dentist or surgeon must know that you take anticoagulants.

In some cases, you may need to stop taking your medication temporarily or adjust your dose for a few days before the procedure to reduce the risk of bleeding. Carrying a card is an easy way to remind healthcare staff of your medicine at every appointment.

Medication interactions

Many common over-the-counter medicines can interact with anticoagulants. For example, common painkillers like ibuprofen and aspirin can significantly increase your risk of stomach bleeding if taken alongside blood thinners.

If you are buying medicine at a pharmacy or being prescribed new treatment by a doctor who is not your usual GP, showing them your card ensures they do not give you anything that could cause a dangerous interaction.

Our anticoagulant ID cards and alert cards

We make durable plastic alert cards to ensure your medical information is always visible when it matters most. You can view and choose these cards using the clickable image links at the top of this page.

We offer two main styles of cards: personalised cards and simple awareness cards.

Personalised anticoagulant ID cards

These cards are designed to carry your specific medical details. They are ideal for everyday carry in a wallet or purse, providing comprehensive information for emergency services.

These cards can include:

• Your full name and date of birth.

• The exact name of the anticoagulant medicine you take (for example, Apixaban or Warfarin).

• Your daily dosage and how often you take it.

• Emergency contact details for next of kin or your primary doctor.

• A clear, recognisable medical symbol on the front to immediately alert emergency staff.

Having your specific dosage and medicine name printed on a card removes any guesswork for paramedics or doctors in an emergency.

Simple awareness cards

If you prefer to keep your personal details private but still want to ensure emergency workers know you take a blood thinner, our simple awareness cards are a reliable option.

These cards are not personalised. They feature bold, clear text such as "ALERT: I take an anticoagulant (blood thinner)" on the front, with general safety instructions on the back. They are designed to be kept in a highly visible place, such as behind your driving licence or in the clear window of your wallet.

All of our cards are printed on high-quality plastic, meaning they will not tear, wear out, or become unreadable over time like paper alternatives.

Our information guides for patients and families

Starting anticoagulant therapy can feel daunting, and family members often worry about the safety of their loved ones on these medications.

We have written a selection of clear information guides to help. These guides are written for patients, friends, and family members to help everyone understand the practical side of taking blood thinners. They explain what to look out for, how to handle minor daily cuts, and how to support someone on this therapy, using simple language without medical jargon. The goal of these guides is to give your family peace of mind and help everyone feel confident managing the day-to-day routine of anticoagulant therapy.

Blood Thinners Explained: The Essential Guide for Individuals on Anticoagulant Medication - The moment they start taking blood thinners, every bumped knee or minor nosebleed feels like an emergency. Here is how to keep your loved one safe and active without living in constant fear.

Daily life and safety tips for people taking anticoagulants

Taking an anticoagulant does not mean you have to stop enjoying your life, but it does mean you need to make a few small adjustments to keep yourself safe.

1. Watch out for minor cuts and scrapes

When you cut yourself, the wound will bleed for longer than it did before you started taking the medicine.

• Apply firm pressure: If you get a minor cut, apply direct, firm pressure to the wound with a clean cloth or bandage for at least 10 to 15 minutes.

• Keep it raised: If possible, keep the injured part of your body raised above the level of your heart to help slow down the blood flow.

• Seek help if it does not stop: If the bleeding does not stop after 15 minutes of continuous pressure, you should seek medical attention.

2. Avoid contact sports and activities with a high risk of falls

Because of the risk of internal bleeding, you should avoid activities where you could easily fall or receive a blow to the head or body.

• Safe activities: Walking, swimming, and cycling on flat, safe paths are generally safe and healthy.

• Activities to avoid: Contact sports like rugby, football, or martial arts should be avoided. You should also take extra care when doing tasks like DIY, gardening, or climbing ladders.

• Wear protective gear: Always wear a helmet when cycling and protective gloves when gardening or using sharp tools.

3. Take care of your teeth and gums

Bleeding gums are a common issue for people on blood thinners.

• Use a soft-bristled toothbrush to avoid irritating your gums.

• Floss gently to prevent cutting the gum tissue.

• Continue to visit your dentist regularly, but always remind them that you are taking an anticoagulant before they begin any treatment.

4. Be careful with other medicines and supplements

Many common substances can interfere with how your blood thinner works.

• Avoid certain painkillers: Do not take aspirin, ibuprofen, or naproxen unless specifically prescribed by a doctor who knows you are on anticoagulants. Paracetamol is generally the safest painkiller to use, but you should still check with a pharmacist first.

• Check herbal remedies: Many herbal supplements, such as St John's Wort, ginkgo biloba, and garlic supplements, can affect blood clotting. Always ask your pharmacist or GP before starting any new vitamin or herbal product.

5. Be consistent with your doses

For your medicine to work properly, you must keep a steady amount of it in your body.

• Take your medicine at the same time every day.

• Set an alarm on your phone or use a pill organiser to help you remember.

• If you miss a dose, consult the patient information leaflet that came with your medicine, or speak to your doctor or pharmacist. Never take a double dose to make up for a missed one.

Common questions about taking anticoagulants

What are the signs of serious internal bleeding?

Because internal bleeding is not immediately visible, it is important to know the signs. You should seek urgent medical help if you experience:

• Blood in your urine (which may look pink, red, or dark brown).

• Blood in your stools, or stools that look black and tarry.

• Coughed-up blood or vomit that looks like coffee grounds.

• Unexplained or severe bruising that spreads quickly.

• Severe, sudden headaches, dizziness, or confusion (which could indicate bleeding in the brain, especially after a bump to the head).

• Nosebleeds that last longer than 10 to 15 minutes and do not stop with pressure.

Can I drink alcohol while taking anticoagulants?

It is generally recommended to limit your alcohol consumption while taking these medicines. Alcohol can increase the effect of some anticoagulants, making bleeding more likely. It also increases the risk of falls and head injuries. If you do drink, keep well within the recommended UK guidelines and try to avoid binge drinking.

Do I need to change my diet if I take anticoagulants?

If you take warfarin, yes. Warfarin is affected by Vitamin K, which is found in green leafy vegetables like spinach, broccoli, and Brussels sprouts. You do not need to stop eating these foods, but you must keep your intake consistent. Sudden changes in how much green vegetables you eat can cause your INR levels to rise or fall dangerously.

If you take a DOAC (like Apixaban or Rivaroxaban), you do not need to make any specific changes to your diet, as these medicines are not affected by Vitamin K.

What should I do if I bump my head?

Any head injury, even a minor bump, can be serious when you take blood thinners because of the risk of bleeding around the brain.

• If you have a minor bump with no other symptoms, monitor yourself closely for 24 to 48 hours.

• If you experience a hard blow to the head, or if you begin to feel dizzy, sleepy, nauseous, have a headache, or develop visual changes after any head bump, go to the nearest accident and emergency (A&E) department immediately. Ensure you show them your alert card as soon as you arrive.

Is it safe to travel while on blood thinners?

Yes, but you should take a few precautions:

• Carry your medicine in your hand luggage, along with a copy of your prescription.

• Keep your anticoagulant ID card with you at all times.

• For long-haul flights or car journeys, make sure you stretch your legs regularly and stay hydrated to prevent clots from forming due to inactivity.