Goserelin acetate (trade name Zoladex, by AstraZeneca) is a drug used to suppress production of the sex hormones (testosterone and estrogen), particularly in the treatment of breast and prostate cancer. It is an injectable gonadotropin releasing hormone superagonist (GnRH agonist), also known as a luteinizing hormone releasing hormone (LHRH) agonist. Structurally, it is a decapeptide.