http://www.medications.com/effect/view/41528 I have been on Singulair about 3 weeks and have been having mood swings, irritability, depression and nightmares. My doctor prescribed Singular after I complained about weight gain from Advair. I was diagnosed with asthma after having a bout with pneumonia Fri, 22 May 2009 11:02:26 -0400 http://www.medications.com/effect/view/41528?item=20023 I hope you are feeling better. Please report your adverse reaction to the FDA as they are continuing their safety review of Singulair and every report will make a difference in the outcome. You can find a link to the FDA's reporting system on the homepa http://www.medications.com/effect/view/41528?item=20023