Which medication is used to reduce stroke risk by preventing blood clot formation?

The medication known for reducing stroke risk by preventing blood clot formation is Coumadin, which is a brand name for warfarin. This anticoagulant works by inhibiting the synthesis of vitamin K-dependent clotting factors in the liver, which ultimately helps to prevent the formation of harmful blood clots in the bloodstream. By reducing the risk of clot formation, Coumadin is particularly effective for patients with conditions such as atrial fibrillation or those who have a history of blood clots, thus reducing the likelihood of stroke.

The other medications listed do not serve the same purpose as Coumadin. Dilantin is an anticonvulsant used primarily to control seizures, Lisinopril is an ACE inhibitor used to treat high blood pressure and heart failure, and Hydrochlorothiazide is a diuretic used to manage hypertension and fluid retention. None of these medications specifically target blood clot prevention to reduce stroke risk.