I'm almost 4 months post brachytherapy, and have just recently been able to go from the 2x FloMax daily down to 1x with no apparent problems. I had some initial urinary problems at the height of my radiation dosage and that's why the uro increased the FloMax. It had really seemed like the double dosage was zapping my energy and stamina levels. Seem to feel much more alert in the afternoon, and don't immediately crash in the evenings after work.
I'm hoping to be able to get off it completely in due time.