My 3 year old daughter began taking Singulair just over 3 weeks a...

My 3 year old daughter began taking Singulair just over 3 weeks ago. At first we didn't notice anything was wrong. By the second week her behavior had changed. She was no longer sleeping and having nightmares and very grumpy during the day. During the third week she still wasn't sleeping. She had terrible muscle cramps and her abdominal pain had her screaming for hours. She was irritable, easily agitated and her behaviour had become very aggressive, hitting. kicking and throwing things. She was a completely different child. We couldn't take her anywhere. There was no leaflet in her box of medication so I went to the phamacist in tears for an explanation and there it was in a tiny paragraph of post marketing experiences right on the last page. I immediately stopped her medication and saw her doctor the next day. She continued to have problems for the next 3-4 days. 5 days later she had returned to her beautiful happy self. And I thank God for that.