Mifepristone is not a hormonal drug, but exists as an antagonistic hormonal drug, which has a reverse effect on hormones. Specifically, it antagonizes progesterone, and in its specific application mifepristone can be used as part of a medication for medical abortion or as part of a medication for inducing labor, which antagonizes progesterone to stop the growth of the embryo and terminate the pregnancy. It can be used as a conservative treatment for fibroids, and can be used in small doses daily to inhibit the growth of fibroids, but it cannot be used for a long period of time, as long-term use may cause the endometrium to undergo undesirable hyperplasia.