Dec 30, 2013 2:00 PM by NBC News
A drug commonly prescribed to prevent strokes in patients with an irregular heartbeat may actually increase that risk during the first month of use.
A new study found atrial fibrillation patients just beginning Warfarin treatment had almost double the risk of stroke compared to patients not taking the drug, especially during the first week.
But once 30 days passed, Warfarin patients cut their stroke risk in half.
Researchers say these findings should not stop doctors from prescribing Warfarin because the stroke risk only affects a small number of patients, but patients should be aware of possible stroke symptoms in the first month of use.
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