Warfarin is used to prevent clots forming in your blood. It reduces your risk of having a stroke and stops new clots forming in your legs or lungs.
Take warfarin regularly as directed. Take it with a glass of water at the same time each day. Follow your health professional’s instructions carefully to make sure you take the right dose.
Warfarin comes in two brands in NZ (Marevan® and Coumadin®). Check which brand you have and stick to it.
Warfarin comes in different strengths, with different colours. Most people take the Marevan® brand shown in the picture below. If your tablets look different than usual, check with your pharmacist.
Take the missed dose if you remember on the same day. If not, skip the dose and carry on as normal. Do not take two doses on the same day. Record the missed doses in your anticoagulant booklet and tell your doctor on your next visit.
Some medicines available without a prescription may react with warfarin including:
Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins (e.g. vitamin K, vitamin E), herbal products (e.g. St John's wort) or recreational drugs.
|Side Effects||Recommended action|
Reduced number of blood cells that help your blood to clot - symptoms include: easy or unusual bruising or bleeding
Coughing or vomiting of blood, vomit that looks like coffee grounds, nose bleeds
Red or dark brown urine, red or black bowel motions
Chest pain, trouble breathing
Headache, dizziness, changes in vision or speech
Skin rash, skin discolouration (blue or purple)
|Tell your doctor immediately|
Yellow skin or eyes
|Tell your doctor|
Hair loss or thinning
|Tell your doctor if troublesome|
If you notice any other effects, discuss them with your doctor or pharmacist.
This leaflet contains important, but not all, information about this medicine.
Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. October 2020
For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?
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My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.
For more information about the sheets, see: What does a My Medicines sheet cover?
My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed