[brityank]

... but the medication is not different.

The formulation DID change.

If only the propellant changed, then the mole weight would be the same.
It's not -- check the PDR.
If the medication had not changed, the formulary for the insurance companies would retain it as a compatible Rx.
It's not -- and they don't.

Get some facts to back up you statements, and provide them.

[r9etb]

It so happens that I have in front of me two packages: one of CFC-propelled (Warrick Pharmaceuticals), and one of non-CFC-propelled albuterol inhalers (Proventil). The latter was a replacement for the former.

The labels for each package state that each inhalation provides 90 mcg of albuterol from the mouthpiece.

So -- should I believe you, or my lying eyes?