Violent anger symptoms and conditions

I have two sons on Singulair, my three old was suspended today from pre-school for bad behavior. Screaming, biting, scratching, and hitting have been going on for the last few months. But worse the past two weeks. He has always been active and played like a boy, but he has been getting violent. We have tried positive reinforcement, praising good behavior both verbally and with rewards, I have tried time-out, being grounded, not being able to participate in activities, no t.v. and old fashioned butt spanking. All of this with no positive results. I am not looking for an excuse for my child's behavior, but could Singulair really be the cause of his aggression?

Wow, this last few months have been a revelation. My big guy (now nearly 7) was diagnosed with Asthma at 18 months or so. He has been on singulair for as long as we can remember, and then since November 07 on Flovent too. He was such a happy baby, just the cutest thing, but as he grew older he got more emotional. A little high strung, quick temper, and some signs of depression. His eating habits were awful, which we thought were due to him having allergies to some foods. We have noticed mood swings and depression, but it would pass. Leg cramps were a common complaint which we brushed off.

Then for some reason we thought it would be a good idea to put him on Flovent too in the winter, well it really went downhill from there. Violent anger, depression, wanting to die, wanting to kill himself, wouldn't eat at all. You name it, he had it. My wife and I were at our wits end, but we didn't think it was the medicine, never entered our minds, and my wife is a paediatric RN too. I sent an e-mail to a psychiatrist friend of mine desperate for help. Well while I was writing it I saw there was a pattern and the sudden slide began the same time he started Flovent. I researched it on the web and OMG the horror, the other parents could have been talking about my boy.

I took him off immediately, co-incidentally his Doc had failed to renew his Singulair scrip the month before so he hadn't been taking it for a month. Well within 24 hours we saw a difference, by the end of the week I cried as I had my boy back. Never thought about Singulair as really we thought it was the Flovent. However after seeing the news today, and having seen a little guy get less and less happy over the years, we realize that the singulair was also affecting him, and then the combo just ripped him apart.

We had filled the Singulair but thankfully were holding off until we saw a pulmonologist and allergist this next few weeks. We will now not be putting him back on it at all. We removed his bedding, got rid of our cats (labs came back highly allergic to them) and tonight after being outside running around in the 40 F air, he went to bed breathing fine. He still is a little emotional, still a little difficult to feed, but we can negotiate, he listens to reason (as much as a 6 yr old will), and more importantly is happy and chatty again.

Has anyone experienced violent anger or separation anxiety?