asthma
"I recently was on Prednisone for over a week because I could barely breathe (in spite of taking 500mg of Advair 2/day and Maxair several times a day). Towards the end of my steroids I was still breathing very poorly, but then I started taking Singulair and immediately my breathing became absolutely normal with not one hint of wheezing or breathing difficulty.

Also, my nasal allergies/sinuses have improved considerably since I started Singulair.

On the other hand, I have noticed pain in my ear (possible ear infection) and my mood appears to be a bit more aggressive than it was before taking the Singulair.  

Overall, I would highly recommend it."