I referred to their therapy as "questionable"....which means exactly what you said...their drug, "either will or will not work". That's what questionable means..
No-that is not what it means.
Simple Definition of questionable
: not likely to be true or correct : giving reason to doubt or question something
: likely to be bad : not worthy of trust Source: Merriam-Webster's Learner's Dictionary
So-when you stated that their therapy is questionable, I assumed you feel that it was not likely to work.
I'm done with this. You're welcome to the last word if you want it.