When I was diagnosed with prostate cancer last January, I stopped injecting testosterone cypionate. I also stopped taking DHEA. Granted I was only injecting 150 mg a week, but I expected there would be some withdrawal side effects. Aside from dropping a little extra weight (25 lbs.), there have been none. I currently weigh about 195 lbs. at 5'11". I feel great, with no adverse moods or loss of energy. My libido is actually better since going off the testosterone injections. No doubt, I lost some muscle. But then, I haven't been hitting the gym either.
On July 2, 2012 I am having a Da Vinci prostatectomy. After the recovery time, I will be back working out and getting fit again. I don't plan of going back on test though, although my doctor was agreeable to that at some point.