Assuming you're attending to the various aspects of good health, the Prozac & Armour shouldn't be much of a problem at all. And they're likely providing some level of support for the weaning off the others.
A 'therapeutic dose' to me, is one that is decidedly therapeutic for someone. Example aspirin/nsaids are taken from 100-800mg...depending upon the pain & the person. The therapeutic dose is one that gives the 'therapy' that is being sought.
I'm sorry I'm not able to be here much - life just isn't allowing that right now (grrrrr!).