The popular drug used to treat irritable bowel syndrome, Zelnorm, was pulled from the market Friday by Novartis, the drug's manufacturer. Zelnorm has been linked to an increased risk of heart attack and stroke, and the FDA recommended Novartis recall the drug.It was the second drug recall in two days. Pergolide, a Parkinson's medicine originally sold by Eli Lilly as Permax and now in generic...