singulair/behavior problems

Doctor prescribed my son (19) sigulair. He has some behavior problems, like angry all the time, easily irritated. I am very worried this is because of medicine. Could this behavior problems occur because of singulair?

I am on singulair and never had such side effects, also if you look on the label, you will see what kind of side effects might occur. Besides, he is 19… puberty and irritation and anger are very typical behavior for puberty. Side effects of singulair are physical and not mental nature, for example: abdominal pain, allergic reaction, dental pain, dizziness, fatigue, fever, … Oh, I see it, there are also some problems that include abnormal dreams and hallucinations! So, maybe his behavior is due to singulair…best is to ask doctor.
Regards!

My daughter, 7, was given Singulair about two months ago. She's recently become moody and hyperactive. She was always a gentle little lamb before this. She also just experienced an hallucination; which is why I'm on the computer.

We're not taking any more. I got on the computer to check it out, and saw that it can cause these and a multitude of other symptoms including Hepatitis for cryin' out loud! We were just using it for common allergies. You'd better believe from now on I'm reading the fine print. I think it was ridiculous to take the side effects risks for a runny nose.

I'm one mad mama.