How do I prevent a second stroke?

Control . Risk factors. Take Aspirin if prescribed. Control blood pressure. Take a statin if ordered. See stroke.Org. No smoking!
Control blood pressu. Following your doctor's instruction on blood pressure control and blood thinners. Strokes have a number of causes and your doctor will diagnose and treat the cause. Unfortunatly, if you have one stroke, your chances of a second are increased.