DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Bruise on the arm of a 61 year old man. This occurred spontaneously during a round of golf. The man had been taking the anticoagulant drug warfarin, which is prescribed to prevent the formation of abnormal blood clots. Abnormal clots can cause heart attacks and strokes. Warfarin has many side-effects, including nausea, loss of appetite and abdominal pain. Easy bruising is one of the most common side-effects. Warfarin is also used as a rat poison as it has the same effect on rats, causing them to die from internal bleeding.
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