Cabgolin (cabergoline) is prescribed to control elevated prolactin levels, a condition called hyperprolactinemia. High prolactin can cause infertility, irregular periods, and milk production in non-pregnant women. Cabergoline works by reducing prolactin secretion from the pituitary gland. It's not used for thyroid issues, vitamin deficiencies, or ovarian diseases directly, though it can help with fertility issues caused by high prolactin.