Local labs are working to develop treatments for neurological disorders, multiple forms of cancer, and dozens of rare genetic diseases. But the next potential blockbuster drug to emerge from the Boston area may target a less fearsome condition that nonetheless afflicts 30 million to 40 million Americans: irritable bowel syndrome. Within the next few weeks, the Food and Drug Administration will decide whether an experimental drug called linaclotide can be approved for sale in the United States.
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