Blood Thinners: Uses, Side Effects, and Drug Interactions

Blood thinners help prevent clots that can block blood flow to the heart. Discover how they work, their side effects, and natural alternatives. Blood clots can block circulation to vital organs like the heart, lungs, or brain. As a result, they can cause a heart attack or stroke.

If you have heart disease, your doctor may advise you to take a blood thinner. It’s crucial to take blood thinners strictly according to your prescription. The medication will be less effective if you do not take enough. Excessive consumption can result in severe bleeding.

What is the Purpose of a Blood Thinner?

Some blood thinners thin the blood to prevent blood cells from adhering together in veins and arteries. Others prevent blood clots by increasing the time it takes for clots to form. These are antiplatelet and anticoagulant medications, respectively.

Antiplatelet medications keep blood cells (known as platelets) from clumping together and forming clots. Antiplatelet drugs include the following:

• Aspirin
• Clopidogrel (Plavix)
• Dipyridamole (Persantine)
• Ticlopidine (Ticlid)

People with certain types of heart disease are frequently prescribed anticoagulants by their doctors. The medical term “coagulate” means “to clot.” These blood thinners work by lengthening the time it takes for your blood to clot.

Anticoagulants help stop blood clots from forming in the first place. Blood thinners that are commonly used as anticoagulants include:

• Warfarin (Coumadin, Jantoven)
• Enoxaparin (Lovenox)
• Heparin

Newer anticoagulants with lower bleeding risks include:

• Dabigatran (Pradaxa)
• Apixaban (Eliquis)
• Rivaroxaban (Xarelto)

Your doctor will closely monitor your blood-thinning medication dosage. For some medications, they may perform a Prothrombin Time (PT) test. This blood test will determine your International Normalized Ratio (INR). The INR indicates the rate at which your blood forms clots. The appropriate INR rate differs from individual to individual based on their medical history. Staying within your INR range can help you avoid excessive bleeding or clotting.

Side Effects

Blood thinners are helpful medicines, but they can cause some side effects. The most common problem is bleeding, because these medicines reduce the blood’s ability to clot.

Common Side Effects

• Easy bleeding: Even small cuts may bleed for a longer time.
• Easy bruising: You may notice bruises on your body more often.
• Nosebleeds or bleeding gums
• Heavy periods in women
• Blood in urine or stool: It may appear red or dark in color.

Other Possible Side Effects

• Dizziness or weakness
• Headache or stomach pain
• Skin rash or hair loss (in some cases)
• Indigestion or stomach discomfort

Serious Side Effects

• Internal bleeding: This can happen after a fall or injury, even if you don’t see any external bleeding.
• Severe bleeding: Vomiting blood or passing black stools needs immediate medical help.
• Bone weakness: Long-term use of some medicines, like heparin, may weaken bones.
• Skin damage (rare): Some medicines like warfarin may cause skin problems in rare cases.

If you notice unusual bleeding or feel unwell, contact your doctor immediately. Regular check-ups help manage side effects and keep you safe while using blood thinners.

Drug Interactions

Certain foods, herbal supplements, and medications can affect how blood thinners work. As a result, these substances can create more or less effective drugs than the recommended dosage. The same substances, however, do not affect all blood thinners. Therefore, it’s critical to talk to your doctor or cardiologist about your diet and how it may affect the efficacy of your medication.

Vitamin K

Some anticoagulants, such as warfarin, can be made less effective by vitamin K. Depending on your medication, you may be able to consume foods containing low to moderate levels of vitamin K. You should, however, avoid eating foods that have moderate to high levels of vitamin K. These are some examples:

• Cabbage
• Brussels Sprouts
• Broccoli
• Asparagus
• Endive
• Kale
• Lettuce
• Spinach
• Mustard Greens
• Turnip Greens
• Collard Greens

Herbs

Anticoagulant medication users should exercise caution when using herbal supplements and teas. Several herbs interfere with blood thinners’ anti-clotting abilities. They may also increase the likelihood and duration of your bleeding.

Consider discussing with your healthcare provider before using any of the supplement herbs, especially:

• Chamomile
• Echinacea
• Clove
• Evening primrose oil
• Dong Quai
• Liquorice
• Ginseng
• Ginkgo biloba
• Goldenseal
• Willow bark

When taking blood thinners, alcoholic beverages and cranberry juice can be harmful. As much as possible, avoid these items.

Medications

When using blood thinners, use caution with prescription and over-the-counter medications. Antibiotics, antifungal medications, pain relievers, and acid reducers can all increase your risk of bleeding. Some medications, like birth control pills, may weaken the effects of anticoagulants and raise the risk of blood clot formation. Make sure your doctor is aware of all medications you are taking.

Natural Blood Thinners

Certain foods and herbs contain natural anticoagulants that can help prevent blood clots. However, if you’re on a blood-thinning medication, consult your doctor before eating these foods because they may cause your blood to thin too much.

Natural anticoagulants include the following:

• Garlic
• Ginger
• Celery seed
• Aniseed

Vitamin E-rich foods are also natural blood thinners. Vitamin E is found in various oils, including olive, corn, soybean, and wheat germ. Other vitamin E-rich foods include:

• Spinach
• Tomatoes
• Mangoes
• Kiwis
• Peanut butter
• Almonds
• Sunflower seeds
• Broccoli

Why and Who Would Need Blood Thinners

Blood thinners help stop dangerous blood clots from forming. Normally, blood clots help stop bleeding after an injury. But sometimes, clots can form inside the body and block blood flow. This can lead to serious problems like a heart attack, stroke, or lung blockage. Blood thinners help reduce this risk.

You may need blood thinners if you have certain health conditions, such as:

• Atrial fibrillation: An uneven heartbeat that may lead to blood clots and raise the risk of stroke.
• Heart diseases: Conditions like coronary artery disease or angina can raise the risk of clots.
• After heart procedures: Such as heart valve replacement or stent placement.
• After major surgeries: Especially hip or knee replacement, where clots can form in the legs.
• Blood clotting disorders: Some people have conditions where their blood clots too easily.
• History of clots: If you had problems like deep vein thrombosis (DVT) or pulmonary embolism before.
• High risk of heart attack or stroke: Doctors may prescribe blood thinners as a preventive measure.

Doctors decide the need for blood thinners based on your health condition and risk factors.

Frequently Asked Questions