Montelukast
"I decided to try Montelukast(generic of Singulair) after a severe bout of cough/flu aggravated by my asthma; which lasted for well over 8 weeks.

Initially I had a very bad headache for at least a week, unabating, and the unusual fatigue and tiredness regardless of what activity I did.



The headache dissipated but the lethargy has continued and I never felt like I regained the energy I used to have.

So this is very disturbing.   I had hoped that after persisting with it for 4-5 months I would feel better but I don't.

The tiredness pretty much starts almost immediately after I have taken the tablet in the evening.

The other thing which is annoying is the stupid, senseless dreams which I find very hard to wake up from!"