JOSH SHER / SCIENCE PHOTO LIBRARY JOSH SHER / SCIENCE PHOTO LIBRARY
Pharmacist. Pharmacist counting out tablets of the drug warfarin for a patient's prescription. Warfarin is an anticoagulant drug that prevents thrombosis, the formation of clots in undamaged blood vessels. Thromboses can cause strokes. It works by preventing blood clotting factors from being formed in the liver.
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