Cetrorelix diacetate is primarily used in the field of reproductive medicine as a gonadotropin-releasing hormone (GnRH) antagonist. It is administered to prevent premature ovulation in women undergoing controlled ovarian stimulation, which is a critical step in assisted reproductive technologies like in vitro fertilization (IVF). By blocking the GnRH receptors, it inhibits the release of luteinizing hormone (LH), thereby delaying ovulation and allowing for the proper timing of egg retrieval. This ensures a higher success rate in fertility treatments. Additionally, it is sometimes used in the management of hormone-sensitive conditions such as endometriosis or uterine fibroids, where suppression of ovarian hormones is beneficial. Its precise action and efficacy make it a valuable tool in both fertility treatments and gynecological therapies.