Kalydeco® (ivacaftor) is approved to treat cystic fibrosis (CF) in people with one of 97 different kinds of CFTR mutations. It can be used by people with CF who are 4 months and older. 1. Cystic fibrosis (CF) is a genetically inherited disease that causes recurring lung infections and gastrointestinal issues that gradually damage many organs. More @Wikipedia
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