This website can be viewed using the vertical display on your mobile device.

This site is intended for US residents 18 years of age or older.
INDICATION

COUMADIN® (warfarin sodium) is a prescription medicine used to treat blood clots and to lower the chance of blood clots forming in your body. Blood clots can cause a stroke, heart attack, or other serious conditions if they form in the legs or lungs.

INR (international normalized ratio) tests are important in helping your healthcare provider determine your response to COUMADIN. INR tests check to see how fast your blood clots. The INR test is primarily used to monitor warfarin therapy, where the aim is to maintain an INR in target range. Your healthcare provider will decide what INR numbers are best for you and may adjust your dose of COUMADIN to keep your INR in your target range.

Your healthcare provider may check INR test results daily when first starting COUMADIN until your INR results stabilize and then will work with you to establish an INR testing schedule. INR tests may also be performed:

  • Prior to any dental or surgical procedure
  • Whenever any other medications are started or discontinued*
  • Whenever you begin taking or stop taking herbal products*

INR tests are typically performed in a hospital or clinic. A small blood sample is taken from a finger prick or a standard blood draw.

*You should inform your healthcare provider of all medications, prescription or over the counter, vitamins, and herbal products that you are taking prior to beginning treatment with COUMADIN.

IMPORTANT SAFETY INFORMATION

What is the most important information I should know about COUMADIN® (warfarin sodium)?

COUMADIN can cause bleeding which can be serious and sometimes lead to death. This is because COUMADIN is a blood thinner medicine that lowers the chance of blood clots forming in your body.

  • You may have a higher risk of bleeding if you take COUMADIN and:
    • are 65 years of age or older
    • have a history of stomach or intestinal bleeding
    • have high blood pressure (hypertension)
    • have a history of stroke, or “mini-stroke” (transient ischemic attack or TIA)
    • have serious heart disease
    • have a low blood count or cancer
    • have had trauma, such as an accident or surgery
    • have kidney problems
    • take other medicines that increase your risk of bleeding, including:
      • a medicine that contains heparin
      • other medicines to prevent or treat blood clots
      • nonsteroidal anti-inflammatory drugs (NSAIDs)
    • take warfarin sodium for a long time. Warfarin sodium is the active ingredient in COUMADIN

Tell your healthcare provider if you take any of these medicines. Ask your healthcare provider if you are not sure if your medicine is one mentioned above. Many other medicines can interact with COUMADIN, and affect the dose you need or increase COUMADIN side effects. Do not change or stop any medicines, or start new ones, before talking to your healthcare provider.

  • Get your regular blood test (INR test) to check for your response to COUMADIN, to see how fast your blood clots. Your healthcare provider will decide what INR numbers are best for you and adjust your dose of COUMADIN to keep your INR in your target range.
  • Call your healthcare provider right away if you get any of the following signs or symptoms of bleeding problems:
    • pain, swelling, or discomfort
    • headaches, dizziness, or weakness
    • unusual bruising (bruises that develop without known cause or grow in size)
    • nosebleeds
    • bleeding gums
    • bleeding from cuts takes a long time to stop
    • menstrual bleeding or vaginal bleeding that is heavier than normal
    • pink or brown urine
    • red or black stools
    • coughing up blood
    • vomiting blood or material that looks like coffee grounds
  • Some foods and beverages can interact with COUMADIN and affect your treatment and dose.
    • Eat a normal, balanced diet and talk to your healthcare provider before making any diet changes. Do not eat large amounts of leafy green vegetables, which contain vitamin K. Certain vegetable oils also contain large amounts of vitamin K. Too much vitamin K can lower the effect of COUMADIN.

Do not take COUMADIN if:

  • your chance of having bleeding problems is higher than the possible benefit of treatment; your healthcare provider will decide if COUMADIN is right for you.
  • you are pregnant unless you have a mechanical heart valve. COUMADIN may cause birth defects, miscarriage, or death of your unborn baby.
  • you are allergic to warfarin or any of the other ingredients in COUMADIN.
  • you are taking other medicines that contain warfarin sodium.

Before you take COUMADIN, tell your healthcare provider if you:

  • have bleeding problems, fall often, have liver or kidney problems, have high blood pressure, have a heart problem called congestive heart failure, have diabetes, have any other medical conditions.
  • are planning to have any surgery or dental procedure; your COUMADIN may need to be stopped for a short time, or your dose adjusted.
  • are pregnant or plan to become pregnant or are considering breastfeeding while taking COUMADIN.

Tell your healthcare providers that you take COUMADIN, and about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Some medicines may affect how COUMADIN works, or may increase your risk of bleeding. Keep a list of medicines to show your healthcare provider and pharmacist.

COUMADIN may cause serious side effects including:

  • Death of skin tissue (skin necrosis or gangrene). This can happen soon after starting COUMADIN, and happens because blood clots form and block blood flow to an area of your body. Call your healthcare provider right away if you have pain, color, or temperature changes to any area of your body. You may need medical care right away to prevent death or loss (amputation) of your affected body part.
  • “Purple toes syndrome.” Call your healthcare provider right away if you have pain in your toes and they look purple or dark in color.

These are not all the side effects of COUMADIN; tell your healthcare provider if you have any side effect that bothers you or does not go away.

What is COUMADIN? Coumadin is a prescription medicine used to treat blood clots and to lower the chance of blood clots forming in your body. Blood clots can cause a stroke, heart attack, or other serious conditions if they form in the legs or lungs.

Call your healthcare provider for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

All individuals depicted are for illustrative purposes only.

Please see U.S. Full Prescribing Information including Boxed WARNING regarding bleeding risk and Medication Guide for COUMADIN.

More Important Safety Information +

IMPORTANT SAFETY INFORMATION

What is the most important information I should know about COUMADIN® (warfarin sodium)?

COUMADIN can cause bleeding which can be serious and sometimes lead to death. This is because COUMADIN is a blood thinner medicine that lowers the chance of blood clots forming in your body.

  • You may have a higher risk of bleeding if you take COUMADIN and:
    • are 65 years of age or older
    • have a history of stomach or intestinal bleeding
    • have high blood pressure (hypertension)
    • have a history of stroke, or “mini-stroke” (transient ischemic attack or TIA)
    • have serious heart disease
    • have a low blood count or cancer
    • have had trauma, such as an accident or surgery
    • have kidney problems
    • take other medicines that increase your risk of bleeding, including:
      • a medicine that contains heparin
      • other medicines to prevent or treat blood clots
      • nonsteroidal anti-inflammatory drugs (NSAIDs)
    • take warfarin sodium for a long time. Warfarin sodium is the active ingredient in COUMADIN