I have used this in the past on two occasions and hated it. I spent the first hour after using it throwing my guts up and it felt like a had worms crawling all over my head. I have also had the injection with no luck whatsoever.

Edited: I have just realised that your son is only 5 years old. These options are definately not for him. Definately speak to the dr
I feel bad for giving it to him now.. He said his tongue felt funny so maybe he felt like there were works or something to but couldn't verbalise it.. He most definetly didn't like it..

I figured he wouldn't be able to take those meds but thanks for the advice anyways..