Warfarin Patient Information
By 藥劑部 Pharmacy | January, 2021
Drug information No.43
Warfarin is the generic name for Coumadin®. It is an anticoagulant (“anti” means against and “coagulation” means clotting). It slows down the clotting process and is therefore used to treat or prevent clots in the veins, arteries, lungs or heart.
Comply with the doctor’s prescription and instruction. Do not start, stop, or change the dose of any drug without checking with your doctor.
- Tell all of your health care providers that you take this drug. This includes your doctors, nurses, pharmacists, and dentists.
- Have your blood work (PT/INR) checked as told by the doctor. This is important to make sure the drug works right and to check your risk of bleeding problems.
- If you will soon undergo surgery or blood tests, please ask your doctor if there’s a need to temporarily discontinue the drug.
- To avoid getting injured, use a soft toothbrush or an electric shaver with caution.
- Inform your health care providers if you plan to use or stop using any drug. (Including prescription drugs, OTC drugs, natural products, or vitamins.)
- Certain foods and health products could influence effect of warfarin:
- (1)May reduce warfarin’s anticoagulant effect and may increase risk of stroke, for example: high intake of vegetables (spinach, cabbage, broccoli, lettuce, green asparagus, etc.), soy products, beef, liver, green tea, and certain health products (For example: Q10-containing composition.).
- (2)May strengthen warfarin’s anticoagulant effects and lead to risk of bleeding, for example: Mango, excessive drinking (beer daily amount greater than 700cc.), cooked onion, certain health products (Including omega-3, ginkgo, cranberry or daily intake of vitamin E is greater than 400IU.).
- Contraindications of warfarin:
- (3)Recent or potential traumatic surgery
- (4)Any of these health problems: Blood vessel problems, aneurysm or dissecting aorta; bleeding problems; bleeding in the brain; active ulcer; bleeding of the stomach, bowel, urinary tract, genitals, or respiratory tract; blood problems; heart infection; low platelet count; pericarditis, or very high blood pressure.
Please keep your diet stable, avoid sudden increased or decreased vitamin K intake in your diet. If eating habits change, be sure to inform your health care providers for any adjustment of your drugs.
Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking warfarin. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat; bleeding after brushing your teeth, blood in your urine or stools, signs of bruising; abdominal pain or diarrhea.
- Drug storage
- Usual shelf life of drug is around three months, except for certain expiration date printed on the medicine label.
- Store drug at room temperature, avoid high temperature or moisture.
- Keep the drug out of the reach of children.
- To avoid danger, DO NOT share your drugs with others.
※ Please consult your doctor or pharmacist if you have any questions.
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