Topics | Fast Facts |
Generic name |
- warfarin (pronounced WAR far in) (generic available)
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Common brand names |
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Common uses |
- Prevent and treat blood clots in certain conditions that increase the risk of clots: surgery, heart attack, heart rhythm problem, heart valve replacement, immobility after an accident
- Prevent transient ischemic attacks (mini strokes, brief episodes of low oxygen to the brain)
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Usual dose |
- Up to 10 mg daily for adult patients; your dose may be based on a lab test that shows how sensitive you are to the medicine
- Doses are periodically adjusted based on INR blood test results
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What to do if you miss a dose |
- If it is still the same day, take the dose as soon as you remember it
- If it is the next day, skip the missed dose and take your normal dose
- Do not double the dose to catch up
- Contact your doctor if you miss two or more doses in a row
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Special instructions and precautions |
- Take exactly as prescribed, the same time each day
- Avoid alcohol, keep eating habits and exercise regular
- You will have a tendency to bleed easily, so use a soft toothbrush, waxed dental floss, electric razor; avoid sharp objects and fall risks, such as climbing a ladder
- Do not start or stop any medicine, including nonprescription medicines, herbals, and vitamins, without letting your doctor or pharmacist know
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Safety during pregnancy/breastfeeding |
- Do not take when pregnant, may cause fetal bleeding or abnormalities
- May take while breastfeeding, but let the infant's doctor know for proper monitoring
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Tell your doctor if you have: |
- Diseases: bleeding disorders, kidney disease, liver disease, thyroid disease, severe high blood pressure, diabetes
- Conditions: surgery, history of falls or if you are at risk for falls, open wound
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Storage and disposal |
- Store at room temperature, protect from light and moisture (do not store in bathroom)
- Dispose of tablets securely in the trash; do not flush down the toilet
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Side effects to report to your doctor immediately |
- Signs of bleeding or clot (see top of page), skin irritation, painful red-purple patches on skin (toe, breast, abdomen), unusual fever, unhealed wounds, yellowing eyes or skin
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Other conditions to report to your doctor |
- Accidents or falls (even if you feel fine), new or stopped medicines (including antibiotics, nonprescription drugs, herbals, vitamins), changes in smoking/eating habits, infection
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Nonprescription medicines/herbals/vitamins that should not be taken with warfarin |
- Aspirin (unless prescribed by your doctor), nonsteroidal anti-inflammatory drugs (ibuprofen [Advil, Motrin], naproxen [Aleve]), most herbals (particularly cranberry, fenugreek, garlic, ginkgo biloba, glucosamine, American ginseng, ginger, goldenseal, coenzyme Q10, St. John's wort, alfalfa, anise, bilberry), cimetidine (Tagamet), vitamins A or E
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Prescription medicines that should not be taken with warfarin |
- Check with your doctor, as many prescription medicines interact with warfarin
- Tell your doctor and pharmacist about all the medicines you take
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Special tests your doctor may prescribe |
- You must have blood tests (called INR) checked regularly
- Your doctor will determine the right INR level (usually between 2 and 3.5) for you
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