"Specifically, I want her to take what her psychiatrist has prescribed unless I agree that she can take less medicine."
I understand your concern here and frustration regarding W's meds, but this is NOT the right approach.
It infantalizes your W and is rather appallingly controlling. I can't even imagine being with a man who would try to get me to make such an agreement. Be a father to your D, not your W.
Instead, set your boundaries and communicate them directly. "W, I want an emotionally healthy partner. So, I am unwilling to work on the M until I believe you are committed to taking the medicines you need to be healthy emotionally. Also, I will not stay in an M with you if I believe that you are not taking the medicines that you need to be healthy emotionally."
Or whatever it is that YOUR boundaries are. Try to look after yourself here by managing your own life and your own boundaries, not by controlling W.
