Zytiga is a medication used to treat prostate cancer, specifically in men whose cancer has spread or is resistant to other treatments. Its active ingredient, abiraterone acetate, works by inhibiting the production of androgens, hormones that can fuel the growth of prostate cancer cells. Typically prescribed alongside prednisone, Zytiga helps to lower testosterone levels, which can slow down or stop the progression of the disease. It is taken orally, and patients usually undergo regular monitoring to assess its effectiveness and manage any potential side effects.