S.H.
My question is:
Does your son have Asthma?
How LONG, has the Doctor said that your son had to take this?
The reason is, a person should not be on it "forever" or for longer than instructed.
It is a Corticosteroid. ie: steroid.
It help to reduce inflammation.
It is used to prevent an Asthma attack. Not stop one that has already begun.
I have Asthma. I have used Flovent before. I had no side effects.
I think your son is simply having age-phase related behavior.
3 is a hard, age.
So is 4 years old.
http://www.drugs.com/flovent.html