Dabigatran is used to prevent stroke and harmful blood clots (such as in your legs or lungs) if you have a certain type of irregular heartbeat (atrial fibrillation). Dabigatran is used to prevent stroke and harmful blood clots (such as in your legs or lungs) if you have a certain type of irregular heartbeat (atrial fibrillation). Dabigatran is used to prevent stroke and harmful blood clots (such as in your legs or lungs) if you have a certain type of irregular heartbeat (atrial fibrillation).