Blood Thinner Linked to Increased Brain Bleeding

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One reason for taking warfarin is to reduce the risk of stroke caused by blockage of a brain artery by a clot. And so, the warfarin user must walk a fine line, reducing the ability of the blood to clot enough to prevent such a stroke but not too much, which can lead to the kind of stroke experienced by people in the study.

"It is very important to have regular testing for your INR level," Woo said.

"There are a variety of reasons to keep INR within that range," said study author Dr. Matthew H. Flaherty, an assistant professor of neurology at the University of Cincinnati. "If it is higher, the chances of bleeding go up. If it is lower, there is less bleeding to start with, and if there is bleeding, there will be less of it."

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More information

Learn why warfarin is prescribed and precautions for its use from the U.S. National Library of Medicine.

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