My son is 3 and has had a cough all of his life. Everytime we wou...

My son is 3 and has had a cough all of his life. Everytime we would take him to the doctor they said his chest sounded clear and they couldn't pin point the problem. I took him to an allergy/asthma doctor where he was allergy tested. Tests showed very minimal allergies. We have no pets, no smoke, and no carpet in our home. The doctor said he didn't have asthma but prescribed him Singulair. After about 6 weeks he was very agitated, to the point I could hardly deal with him. Very aggressive with everyone in the family, could not sleep at night, and had severe hallucinations of bears in his room and he would see sharks in the bathtub to the point where he was crying and begging to get out of the bathtub. When I read the small print on the side effects I knew that it was the medication.