Kitty
There is an over the counter inhaler that has epinephrine in it. It's the same thing that is used in the epi pen for allergic reactions. Epinephrine is naturally produced by the body when the sympathetic nervous system is active. This opens airways, dilates pupils, stops digestion etc. I'm not going to list everything it does but it is what is active when you are in the fight or flight mode and the important thing is that it opens airways. Though if your son has sever asthma you do not want to brush it off and not use the inhaler his doctor prescribed. It could kill him. But for minor attacks you can use the over the counter inhaler.

Cullen Adams
I have cured my asthma naturally and would love to help you do the same for your son. A doctor will never prescribe a natural treatment for asthma if they want to keep their license, but that doesn't mean that they don't exist. The health system is government by pharmaceutical companies and always will be. Drop me an email anytime mail@HowToCureAsthmaNaturally.com Ill happily give you a copy of my book for FREE.