Anti-androgenic means that a substance keeps the body from producing or using male sex hormones. There are both steroidal and non-steroidal anti-androgens, according to Web MD.
Anti-androgen therapy may be used as part of a broader hormone therapy to slow or block hormone production. It is often used as part of the treatment plan for prostate cancer.
Anti-androgenic drugs have many potential side effects including nausea, diarrhea and sexual problems. Long-term treatment also may cause osteoporosis.