Note: “Flu” is listed as a side effect for some medicines. But these medicines do NOT cause the flu. The flu is a contagious respiratory infection caused by a virus. “Flu” may be listed as a side effect because it was reported as one during a drug’s clinical trials, and the FDA requires that it be listed as it was reported. But it may mean “flu-like symptoms” or “respiratory infections.” It is very important that you take your prescribed medicines as directed and get a flu shot every year. If you have any questions about side effects, talk to your health care provider.

The Asthma and Allergy Foundation of America does not endorse a particular medicine or product.