JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Warfarin pills. Pills of the anticoagulant drug warfarin lying on a prescription. Warfarin is taken to prevent thrombosis, the formation of clots in undamaged blood vessels. Thromboses can cause strokes. The drug works by preventing blood clotting factors from being formed in the liver.
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