The most popular blood thinner medication is warfarin (brand name Coumadin) and is used to treat certain types of heart disease, according to WebMD. Other types of blood thinners in pill form include Eliquis, Pradaxa and Xarelto. Blood thinners that are administered intravenously are heparin, Lovenox and Fragmin.
Blood thinners are used to prevent blood clots in a variety of ways, states WebMD. Heparin helps increase natural anti-clotting proteins in the body, and Fragmin lowers the amount of clotting proteins in the blood. Eliquis and Xarelto are typically used after hip or knee replacement surgery or for patients who have an irregular heartbeat. Pradaxa works by preventing thrombin, a clotting protein, from forming harmful blood clots.