What are the most common symptoms of warfarin overdose?

Bleeding every were: The most important effect of a Coumadin (warfarin) overdose is bleeding. Include obvious bleeding, such as vomiting of blood, nosebleeds, or bright red blood in the stool, or bleeding that is less obvious, such as internal bleeding. Signs of an overdose might include: easy bruising cuts or scrapes that are slow to stop bleeding signs of gastrointestinal bleeding, such as: black, tarry stools bright red blood.

Warfarin OD: Coumadin (warfarin) overdose symptoms may include blood in stool or blood, black & tarry bowel movements, ^'ed menstrual bleeding, ^'ed bruising & petechiae. See: http://www.rxlist.com/coumadin-drug/overdosage-contraindications.htm