To Todd1963:
Considering the fact that all medications work in different ways, or with different success or failure rates first ...... I was on zytiga for about 5-months in 2012. When starting, my PSA was not astronomically high, and it did not lower either during my zytiga. Again ... a different body ... different growth of the cancer likely ... and whatever else.
The side effects were minimal. And I was taking prednisone (5mg twice daily) and lupron 45ml every 6-months at the same time.
There was little loss of hair, no noticeable pain anywhere, some tiring but I think that was mostly the lupron, no nausea, no hot flashes - but, after the first several weeks on zytiga, my apattite went South!!!! And it stayed that way for 4-months - losing 45-pounds (at least 30-pounds was needed). Finally, funny enough, I tried Ben & Jerry's Ice Cream for the first time, and that got me to start eating again.
The best of luck to you on the zytiga.
Rob