Side effects are not common but can happen. The most common are bruising or minor bleeding. Expect to bruise easier while on warfarin. To lower your chance of bleeding, your INR should be in the range set for you. Tell your provider right away if you have any side effects listed below. You may need to change your dose.
Signs of bleeding or a high INR are:
Bleeding from cuts that do not stop
Nosebleeds that do not stop
Gums bleed when you brush your teeth
Coughing up blood
Vomit that looks like coffee grounds
Bruising in unusual areas or for unknown reasons
Heavy periods or unexpected bleeding from the vagina
Bowel movements (poop) that looks black or have blood in them
Red or rust-colored (blood) in the urine (pee)
Bleeding in the eye
Getting a sudden headache, dizziness, or weakness
What are signs of a blood clot?
You are taking warfarin to help protect you from having a blood clot or prevent you from getting another one. Call your provider if you have:
Painful and constant swelling or redness in your feet, lower legs, or arms
Bad headache
Blurred vision
Dizziness
Trouble breathing
Chest pain
Feelings of severe weakness
Numbness or tingling of hands, feet, or face
Not being able to move
Sudden confusion
Call your provider if you have:
Fever and chills for more than 2 days
A stomachache or diarrhea for more than 2 days
Bad stomach aches, stomach pain, or belly swelling
Bad headache
Skin rash, hives, or itching
Very rare, but serious, side effects are skin necrosis (death of skin tissue) and purple toe syndrome.
The contents of this website are for information purposes only and not intended to be a substitute for professional medical advice, diagnosis, or treatment. Users should not rely on the information provided for medical decision making and should direct all questions regarding medical matters to their physician or other health care provider. Use of this information does not create an express or implied physician-patient relationship.