Singulair Side Effects: April I started Singulair last Thursday night and felt tired a http://www.medications.com/effect/view/41040 April I started Singulair last Thursday night and felt tired and depressed 29th on Friday but thought it was something going on in my life. On 2009 Saturday, I had severe, throbbing headaches all day but took the Singulair for the th Please report it to the FDA and good luck,hope you feel better so Fri, 01 May 2009 06:44:53 -0400 http://www.medications.com/effect/view/41040?item=19404 Please report it to the FDA and good luck,hope you feel better soon!Kate http://www.medications.com/effect/view/41040?item=19404 I also was just put on Singular about 3 weeks ago. Took it for ab Fri, 05 Jun 2009 20:41:36 -0400 http://www.medications.com/effect/view/41040?item=20405 I also was just put on Singular about 3 weeks ago. Took it for about a week until I noticed I was having shortness of breath. I had trouble going up my stairs without getting winded. Went back to dr. has put me on an inhaler, antibotics, which just before http://www.medications.com/effect/view/41040?item=20405 I actually ended up in the ER because I went "A Fib," meaning my Fri, 05 Jun 2009 21:53:55 -0400 http://www.medications.com/effect/view/41040?item=20406 I actually ended up in the ER because I went "A Fib," meaning my heart rate was extremely accelerated and irregular. I was in for 6 days and finally had my heart shocked to put it back in "sinus rhythm." I have only been "A Fib" one other time in my life http://www.medications.com/effect/view/41040?item=20406