Warfarin (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Abdominal or stomach pain with cramping
• Bleeding gums
• Blood in the urine
• Bloody stools
• Blurred vision
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Chest pain or discomfort
• Confusion
• Coughing up blood
• Difficulty with breathing or swallowing
• Dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
• Excessive bruising
• Headache
• Increased menstrual flow or vaginal bleeding
• Nosebleeds
• Paralysis
• Peeling of the skin
• Prolonged bleeding from cuts
• Red or black, tarry stools
• Red or dark brown urine
• Shortness of breath
• Sweating
• Unexplained swelling
• Unusual tiredness or weakness

• Arm, back, or jaw pain
• Blue-green to black skin discoloration
• Blue or purple toes
• Change in consciousness
• Chest tightness or heaviness
• Chills
• Clay-colored stools
• Diarrhea
• Dizziness
• Fainting or loss of consciousness
• Fast or irregular breathing
• Fast or irregular heartbeat
• Fever
• Itching
• Light-colored stools
• Loss of appetite
• Nausea and vomiting
• Pain in the toes
• Pain, redness, or sloughing of the skin
• Pale skin
• Skin blisters
• Skin rash
• Small red or purple spots on the skin
• Stomach pain
• Swelling of the eyes or eyelids
• Tightness in the chest or wheezing
• Troubled breathing with exertion
• Unpleasant breath odor
• Unusual bleeding or bruising
• Upper right abdominal or stomach pain
• Vomiting of blood
• Yellow eyes and skin

• Painful or prolonged erection of the penis

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Joint pain
• Muscle pain

• Bloated
• Change in taste, or bad, unusual, or unpleasant (after) taste
• Cold intolerance
• Excess air or gas in the stomach or intestines
• Full feeling
• General feeling of discomfort or illness
• Hair loss or thinning of the hair
• Hives or welts
• Lack or loss of strength
• Pain
• Passing gas
• Red, sore, or itching skin
• Sores, welting, or blisters
• Unusual drowsiness, dullness, or feeling of sluggishness

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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