FDA expands use of asthma drug Xolair to treat severe food allergies

A medication used to treat asthma can now be used to help people with food allergies avoid severe reactions, the U.S. Food and Drug Administration said Friday.

Xolair, the brand name for the drug omalizumab, became the first medication approved to reduce allergic reactions caused by accidental exposure to food triggers. Patients as young as age 1 with allergies can take the drug by injection every two to four weeks, depending on their weight and their body's response to allergens.

An estimated 17 million people in the U.S. have the type of food allergies that can cause rapid, serious symptoms, including severe, whole-body reactions that are potentially deadly.

People who use Xolair must continue to avoid the foods that cause them reactions, such as peanuts, cashews, hazelnuts, walnuts, milk products and eggs. The medication allows them to tolerate higher amounts of such foods without causing major reactions.