Montelukast
"Inhaler from allergist didn't help breathing problems. I always felt the fresh air I breathed in only got half way down and then hit a filter of some sort. Had wheezing/whistles every day at the end of my exhale. Inhaler didn't help. Out of breath over the slightest activity.  Got an prescription from family practice doc for this. This has eliminated my wheezing and out of breath feeling. I'm allergic to just about everything year round. It did not eliminate my need for allergy medication but it has made my breathing perfect. I wouldn't ever want to do without this medication. "