The US FDA has approved Bayer's Sunharbo drug to prevent recurrent strokes. According to the Wall Street Journal, the drug reduces the risk of a second attack by 26% without increasing the likelihood of internal bleeding. The cost of a 30-day course will be $748.5. Analysts expect annual sales of the drug to reach $4.5 billion, which will allow Bayer to offset losses from patent expirations on other drugs.