The first generic version of the popular Advair asthma inhaler has been approved by U.S. regulators. The Food and Drug Administration on Wednesday approved Mylan's version in three strengths for ages 4 and up. The inhalers are used twice daily to keep airways open and prevent flare-ups of wheezing, shortness of breath and other symptoms of asthma or chronic obstructive pulmonary disease.Read more on NewsOK.com