FDA Warns About Asthma Drug, Xolair

The FDA is calling for a "black box" label warning for the asthmaasthma drug Xolair, alerting users it can cause potentially life-threatening allergic reactions.

The FDA issued the alert after reviewing 48 cases of anaphylaxis -- life-threatening allergic reactions - submitted to the agency from June 2003, when Xolair was approved, through December 2005.

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