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You won't believe these 10 facts about people. A blood thinner, or anticoagulant, is a drug that is used to prevent blood clots from forming or to lengthen the time that it takes for blood clots to form. These drugs are often used by people who are at risk for heart attack, stroke or heart disease.
People take blood thinners to increase the amount of time it takes blood to form a clot. They don't actually thin the blood. Thick blood would be blood that clots too fast. Oftentimes heart patients have to take blood thinners (anticoagulants such as coumarin) because they already have a tendancy to clot too quickly.