According to Medical Oncologist Stephen B. Strum, (co-author of A Primer of Prostate Cancer) T levels should be held at or <20 ng/dl, and the PSA UDT level of <0.05 for at least 12 months before considering a vacation of ADT. During this time both levels should be monitored (every 3-4 months) to make sure alls well. If it is, then enjoy the off time of which it may take a couple of months before the medication wears off and the T level gradually increases. Depending on how effective the original treatment was (surgery, radiation, etc) will determine the length of the good times.
I should be the poster boy for Lupron because I had EVERY side effect known to exist because of its use, including a sneaky one that you should be aware of. Bone loss. A bone density test (DEXA or QCT) is suggested at the earliest of PC treatments so a base line can be established early. Don't let ADT surprise you later with a Dx of Osteoporosis. In some cases it can happen very quickly. I was surprised after a density test that I had developed severe Osteoporosis and I am taking Calcium Citrate (2,000 mg. daily) and Vit D3 (5,000 iu. daily) to help reduce its rate of loss. My Oncologist advised that Zometa is in my future but is holding off for a little while longer. He has said the same thing about ADT, which is not a big surprise because of the slowly increasing PSA.
I have had a good run during this vacation (except for the ED, which is another story) and have all the confidence in the world about having another down the road.......
Hopes this helps answer a few questions.