what does a blood thinner do?
<answer> Prevent blood clots from forming or to lengthen the time that it takes for blood clots to form. <context> 10 hilariously insightful foreign words. 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.arfarin. In some cases, aspirin is not a strong enough blood thinner to address the risk of potentially life-threatening clots forming. The second most common blood thinner is warfarin. It is much stronger than aspirin, so its use must be carefully monitored.