A medication that is used in combination with other medications to treat prostate cancer that has spread to other places of the body. Zytiga is a brand name for abiraterone acetate, which is used to treat individuals with cancer that is castration resistant (has not responded to treatments that suppress testosterone levels) or high risk and castration sensitive (has responded to treatments that lower testosterone levels). It's also known by the brand name Yonsa, and it's used to treat people with castration-resistant cancer. Abiraterone acetate is also being researched for its use in the treatment of various cancers.