The studies show that Zyvox was as well-tolerated and effective as vancomycin, a common hospital antibiotic.

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Study leader Professor Jonathan Waxman, from Imperial College London, said vitamin D therapy was effective and well-tolerated.

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VX-661 was generally well-tolerated, both as monotherapy and in combination with ivacaftor, and most adverse events were mild to moderate in severity and similar between the treatment groups and those who received placebo.

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