Pituitary amenorrhea is most commonly caused by pituitary tumors, commonly prolactin-secreting adenomas, due to the increased secretion of prolactin, which leads to amenorrhea in women. The dose is 5-5 mg per day, and usually normalizes menstruation in the 5th-6th week after taking the drug. If the pituitary tumor is more severe, surgery is required. Another cause of pituitary amenorrhea is Sheen syndrome, which is caused by postpartum hemorrhage and is treated clinically with estrogen and progestin cycle therapy, using a combination of estrogen and progestin drugs for 3-6 months to restore menstruation.