http://www.medications.com/effect/view/30319 An element of the side effects of Singulair that are listed here are musculo-skeletal symptoms. Quinolones such as levaquin are known to cause those issues. Singulair is a quinoline, while not the exact same category, their roots are similar. It makes th Thu, 15 May 2008 09:42:20 -0400 http://www.medications.com/effect/view/30319?item=8294 I took Singulair for 3 yrs, 10/04-10/07. it was extremely effective in treating my asthma, allergies, and even my rosacea. I was exercising 3 days a wk at a gym, yoga, spinning, light weights. instead of becoming stronger and more limber, I started getting http://www.medications.com/effect/view/30319?item=8294