Warfarin
Generic name: Warfarin (oral)
Drug class:
Coumarins and indandiones
Usage of Warfarin
Warfarin is an anticoagulant (blood thinner). Warfarin reduces the formation of blood clots.
Warfarin is used to treat or prevent blood clots in veins or arteries, which can reduce the risk of stroke, heart attack, or other serious conditions.
Warfarin may also be used for purposes not listed in this medication guide.
Warfarin side effects
Get emergency medical help if you have signs of an allergic Reaction to warfarin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Warfarin increases your risk of bleeding, which can be severe or life-threatening. Call your doctor at once if you have any signs of bleeding such as:
Clots formed by warfarin may block normal blood flow, which could lead to tissue death or ampUTAtion of the affected body part. Get medical help at once if you have:
Bleeding is the most common side effect of warfarin.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Before taking Warfarin
You should not take warfarin if you are allergic to it, or if:
You also should not take this medicine if you are prone to bleeding because of a medical condition, such as:
Do not take warfarin if you are pregnant, unless your doctor tells you to. Warfarin can cause birth defects, but preventing blood clots may outweigh any risks to the baby. If you are not pregnant, use effective birth control to prevent pregnancy while taking warfarin and for at least 1 month after your last dose. Tell your doctor right away if you become pregnant.
Warfarin can make you bleed more easily, especially if you have ever had:
To make sure warfarin is safe for you, tell your doctor if you have ever had:
It is not known whether warfarin passes into breast milk. Watch for signs of bruising or bleeding in the baby if you take this medicine while you are breast-feeding a baby.
Relate drugs
How to use Warfarin
Take warfarin exactly as prescribed by your doctor. Follow all directions on your prescription label. Your doctor may occasionally change your dose. Do not take warfarin in larger or smaller amounts or for longer than your doctor tells you to.
Take warfarin at the SAMe time every day, with or without food. Never take a double dose.
Warfarin can make it easier for you to bleed. Seek emergency help if you have any bleeding that will not stop.
You will need frequent "INR" or prothrombin time tests (to measure your blood-clotting time and determine your warfarin dose). You must remain under the care of a doctor while taking this medicine.
If you receive warfarin in a hospital, call or visit your doctor 3 to 7 days after you leave the hospital. Your INR will need to be tested at that time. Do not miss any follow-up appointments.
Tell your doctor if you are sick with diarrhea, fever, chills, or flu symptoms, or if your body weight changes.
You may need to stop taking warfarin 5 to 7 days before having any surgery, dental work, or a medical procedure. Call your doctor for instructions.
Wear a medical alert tag or carry an ID card stating that you take warfarin. Any medical care provider who treats you should know that you are taking this medicine.
Store at room temperature away from heat, moisture, and light.
Warnings
You should not take warfarin if you are prone to bleeding because of a medical condition, if you have an upcoming surgery, or if you need a spinal tap or epidural. Do not take warfarin if you cannot take it on time every day.
Warfarin increases your risk of severe or fatal bleeding, especially if you have certain medical conditions, if you are 65 or older, or if you have had a stroke, or bleeding in your stomach or intestines. Seek emergency help if you have any bleeding that will not stop.
Call your doctor at once if you have other signs of bleeding such as: swelling, pain, feeling very weak or dizzy, unusual bruising, bleeding gums, nosebleeds, heavy menstrual periods or abnormal vaginal bleeding, blood in your urine, bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds.
Many other drugs can increase your risk of bleeding when used with warfarin. Tell your doctor about all medicines you have recently used.
Avoid making any changes in your diet without first talking to your doctor. Some foods can make warfarin less effective.
What other drugs will affect Warfarin
Many drugs (including some over-the-counter medicines and herbal products) can affect your INR and may increase the risk of bleeding if you take them with warfarin. Not all possible drug interactions are listed in this medication guide. It is very important to ask your doctor and pharmacist before you start or stop using any other medicine, especially:
This list is not complete and many other drugs can interact with warfarin. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
Disclaimer
Every effort has been made to ensure that the information provided by Drugslib.com is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Drugslib.com information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Drugslib.com does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Drugslib.com's drug information does not endorse drugs, diagnose patients or recommend therapy. Drugslib.com's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners.
The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Drugslib.com does not assume any responsibility for any aspect of healthcare administered with the aid of information Drugslib.com provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
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