http://www.medications.com/effect/view/42091 I discovered my son's side effects from singulair a little over 2 years ago. He had used Singulair for approx 3 years. I did not recognize that he was suffering side effects until his ped increased his dosage to 5mg. At that point, it was loud and clear. Tue, 16 Jun 2009 11:05:49 -0400 http://www.medications.com/effect/view/42091?item=20670 My son is 10 and has been on Singular since he was 8 for allergies. For the past year, he has been suffering from axiety and irrational fears and leg pains. My husband and I have told his pedi, but she said it was normal. I heard about the Singular war http://www.medications.com/effect/view/42091?item=20670