breathing treatments . . .

can be very good. They can return you to the world of easy breathing in just a few moments.
Just not when you accidentally use albuterol that happens to be expired.
Because, if for some reason, you were to use expired albuterol,  you would be very shaky for the next hour.  You would not be able to type very well and you might spill your drink all over your nice new skirt.
Although your breathing would eventually get better and you wouldn't be coughing as much, you would be very thirsty and very shaky.
at least, that's what I think would happen.
I'd never be unobservant enough to open an expired package of albuterol, carefully twist off the cap and completely empty the entire dosage into the medication cup.
And if I did happen to do all of that, and then use the abovementioned albuterol, I would totally stop the breathing treatment when I read the expiration date on the package.