Albuterol works well as a rescue sprayer for me and my wife, who is a chronic asthma sufferer. One has to know how to use it:
It works a little better for us if we press the button about 1/4 the way through the inbreath.

What we're really supposed to do is to use a special air chamber between the sprayer and mouth, which sort of vaporizes the material before it reaches the mouth:
A little awkward to carry and use on the bike though, so on the bike it's the naked sprayer.

My wife always uses hers immediately before a hard bike ride, so it is also a prophylactic.