The FDA expanded approval for the asthma drug Xolair for multiple food allergies including peanuts and tree nuts to reduce reactions from accidental exposures.
Xolair for food allergies: How it works and what it costs nbcnews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nbcnews.com Daily Mail and Mail on Sunday newspapers.
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