Emotional behaviors symptoms and conditions

My wife and I recently took my daughter to an asthma specialist and she was prescribed Flovent and Singulair as everyday suppressive treatment. Our daughter is only 4 and the first evening of taking SIngulair she was exhibiting exaggerated emotional behaviors such as sadness and excessive crying (sad/moping). The following day the same emotional state was there without anger, but with abnormal crying (for my daughter). She went to preschool and her teacher said she was saying things such as, "I don't care", "I don't need anyone", "I hate this", etc. These are not normal behaviors for our typically happy child. Her doctor said suicidal thoughts and depression were possible side effects in adults, but I am beginning to think they apply to children as well. After only 4 days of Singulair we have decided to stop the treatment. I hope these comments help some of you other parents experiencing the same thing. -Rob