http://www.medications.com/effect/view/28626 I too am on Singulair and have no side effects. But the issue is not adults on Singulair it is children it is a drug that affects them differently. My daughter is 8 years old and has been on it for 3 years. She has been exhibiting similar symptoms as all Fri, 28 Mar 2008 18:12:20 -0400 http://www.medications.com/effect/view/28626?item=6073 Is she seeing an allergist? I would recommend that first. Find one who is a good prescriber as some are easily swayed by the drug companies. My son's allergist took him off today after 4+ years. The inhaled steroids might be a better option. I have h http://www.medications.com/effect/view/28626?item=6073