What side effects may I notice from receiving Warfarin?

Side effects that you should report to your care team as soon as possible:
-Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
-Bleeding—bloody or black, tar-like stools, vomiting blood or brown material that looks like coffee grounds, red or dark brown urine, small red or purple spots on skin, unusual bruising or bleeding
-Bleeding in the brain—severe headache, stiff neck, confusion, dizziness, change in vision, numbness or weakness of the face, arm or leg, trouble speaking, trouble walking, vomiting
-Dark or purple painful toes
-Heavy periods
-Painful swelling, warmth, or redness of the skin, blisters or sores
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
-Diarrhea
-Hair loss

This list may not describe all possible side effects for Warfarin. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.