Singulair and retention

My son was prescribed Singulair for a seasonal bronchial condition. It seemed to be the answer to his problems as the chronic cough stopped. HOWEVER, since then I have had many meetings with his teachers regarding his lack of ability to focus, inability to follow directions, retention and comprehension. In addition, he recently has develped a twitch in his eye where he blinks often and says that his eye burns him. I am so upset. To think that I had such incredible faith in this "wonder" medication that helped my son's cough, but has had such a detrimental effect on his school work. I am stopping the medication today in the hopes that I can save my son's self esteem. I wish somebody had told me what to look out for. After many meetings with teachers and school psychologists I could simply have stopped it all by taking him off the medication. The answer to his difficulty was there in the pink little pill he takes every night. Shame on me. Shame on me. No more singulair for my boy. Never again.