Since the topic of medicines has come up here, I always wonder about my 15-year-old son's asthma inhaler. (I should mention that my son has had zero symptoms over the last 3 years, but of course,when I visit China I bring it in the event of an emergency, which has never occurred.) I have done internet searches and have not come up with a clear answer.

I bring the doctor's prescription with me and, so far, have had zero problems, but since it is so important, I would like to know what type of category the inhaler falls into so that if something weird happens, I will know how to deal with it.