[dontknowme]

Absolutely, even when the active compounds are the same but there are changes in composition.

For instance, I'm an asthmatic and I need to use a spray inhaler. The no-brand equivalent is exactly the same, and does work the same in normal circumstances, except has roughly 1/2 of the propellant. But I can tell you that the missing propellant makes all the difference when you're having a stronger attack and cannot inhale.