It is used to treat advanced prostate cancer. Cyproterone block the effect of the hormone called testosterone. This causes a reduction in the production of testosterone in the testicles, which prostate cancer cells require for growth. To suppress 'flare' with initial LHRH analogue therapy. In long-term palliative treatment where LHRH analogues or surgery are contraindicated, not tolerated, or where oral therapy is preferred, In the treatment of hot flushes in patients under treatment with LHRH analogues or who have had orchidectomy.