Nafarelin is primarily used in the treatment of endometriosis and central precocious puberty (CPP). In endometriosis, it helps reduce pain and the growth of endometrial tissue outside the uterus by lowering estrogen levels. For CPP, it delays premature puberty by suppressing the production of sex hormones. Additionally, it is sometimes used in assisted reproductive technologies to control ovulation timing. The chemical is administered as a nasal spray, providing a non-invasive delivery method for consistent hormone regulation.