I know for a fact that Singulair can cause ear ache
and chest infection as well as other annoying
side effects because I have had them, I got off of the medication because I didn't see improvement, my friend stayed on it and loves what it does for her. My mother in law is on it and loves it. Oh I should also mention that it also takes about 1-2 months for some long term asthma medication to take full effect so don't take it for 2 weeks and say it isn't working, give it a chance!