Casodex is a prescription medicine called an androgen receptor inhibitor, used in combination with lutenizing hormone-releasing hormone (LHRH) medicines to treat stage D2 metastatic prostate cancer (cancer that has started in the prostate and has spread to other parts of the body). Casodex is in a class of medications called nonsteroidal antiandrogens. It works by blocking the effect of androgen (a male hormone), to stop the growth and spread of cancer cells. Casodex along with the luteinizing hormone-releasing hormone may help stop the growth and spread of cancer cells but does not cure prostate cancer. It is not known if Casodex is safe and effective in children.