The prescription blood-thinners Pradaxa (dabigatran) and warfarin aim to reduce stroke and other cardiovascular disorders, but like most medications, they do carry some risks.

People with atrial fibrillation, a common heart rhythm disorder, face a high likelihood of stroke. To reduce the risk, the American Academy of Neurology recommends taking anticoagulants.

People with abnormal heart rhythms are at a higher risk of getting blood clots, which can cause a stroke. A blood-thinning medication may help. But some questions remain if these medications cause the bleeding.