Cetrotide (generic name: cetrorelix) is a synthetic decapeptide with potent gonadotropin-releasing hormone (GnRH) antagonist properties, used primarily in assisted reproductive technologies (ART) such as in vitro fertilization (IVF). It works by inhibiting the secretion of luteinizing hormone (LH) from the pituitary gland, thereby preventing premature ovulation. This allows for the controlled stimulation of the ovaries to produce multiple eggs, which is crucial for the success of IVF procedures. Cetrotide is administered via subcutaneous injection and is typically used in a short protocol during the middle to late follicular phase of the menstrual cycle, under the guidance of a healthcare professional specialized in reproductive medicine.