COPD
"I&#039;ve had COPD for several years and was prescribed Singular (montelukast) to prevent sleep time exacerbation&#039;s.  I mean severe too!  One night when in the hospital, boom!  It hit me and I was even on oxygen.  Well, since taking montelukast, even as the generic of Singular (as some may agree, generics often don&#039;t have the same effect as brand names), I have had no night time problems."