Blood thinners are medicines that prevent blood clots from forming. They also keep existing blood clots from getting larger. Clots in your arteries, veins, and heart can cause heart attacks, strokes, and blockages. You may take a blood thinner if you have
- Certain heart or blood vessel diseases
- An abnormal heart rhythm called atrial fibrillation
- A heart valve replacement
- A risk of blood clots after surgery
- Congenital heart defects
There are two main types of blood thinners. Anticoagulants such as heparin or warfarin (also called Coumadin) slow down your body's process of making clots. Antiplatelet drugs, such as aspirin, prevent blood cells called platelets from clumping together to form a clot.
When you take a blood thinner, follow directions carefully. Blood thinners may interact with certain foods, medicines, vitamins, and alcohol. Make sure that your healthcare provider knows all of the medicines and supplements you are using. You will probably need regular blood tests to check how well your blood is clotting. It is important to make sure that you're taking enough medicine to prevent clots, but not so much that it causes bleeding.
- Anti-Clotting Agents Explained (American Heart Association)
- Anticoagulant Medicine: Potential for Drug-Food Interactions (National Jewish Health)
- Anticoagulants (Texas Heart Institute) Also in Spanish
- Blood Thinner Pills: Your Guide to Using Them Safely (Agency for Healthcare Research and Quality) Also in Spanish
- What Are Anticoagulants and Antiplatelet Agents? (American Heart Association) - PDF
- What You Need to Know When Taking Anticoagulantion Medication (National Jewish Health) - PDF
- Blood Thinners and Dental Care (American Academy of Oral Medicine)
- Blood Thinners: Can I Still Get Blood Clots? (Mayo Foundation for Medical Education and Research) Also in Spanish
- Bridging Anticoagulation: Is it Needed When Warfarin Is Interrupted Around the Time of a Surgery or Procedure? (American Heart Association)
- Heparin-Induced Thrombocytopenia (American Heart Association) - PDF
- Important Information to Know When You Are Taking: Warfarin (Coumadin) and Vitamin K (National Institutes of Health, Clinical Center) - PDF Also in Spanish
- Medication Interactions: Food, Supplements and Other Drugs (American Heart Association)
- PT and INR Test (American Association for Clinical Chemistry)
- Warfarin Side Effects: Watch for Interactions (Mayo Foundation for Medical Education and Research) Also in Spanish
Statistics and Research
- Commonly Prescribed Blood Thinner Associated with Higher Risk of Post-Surgery Complications (National Institute of Arthritis and Musculoskeletal and Skin Diseases)
- ClinicalTrials.gov: Anticoagulants (National Institutes of Health)
- ClinicalTrials.gov: Heparin (National Institutes of Health)
- ClinicalTrials.gov: Platelet Aggregation Inhibitors (National Institutes of Health)
- ClinicalTrials.gov: Warfarin (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: The benefit of betrixaban for the extended thromboprophylaxis in acutely...
- Article: Anticoagulants is a risk factor for spontaneous rupture and hemorrhage...
- Article: Cardiac Involvement in Emery-Dreifuss Muscular Dystrophy and Related Management Strategies.
- Blood Thinners -- see more articles