Antiprogestogen

An antiprogestogen, also called an antiprogesterone agent, or in the case of a synthetic compound, an antiprogestin, is a type of hormone antagonist in which that antagonizes or suppresses the actions of progesterone in the body, a sex hormone that plays a role in the menstrual cycle and pregnancy. Antiprogestogens may stop some cancer cells from growing and they are being studied in the treatment of breast cancer.

An example of an antiprogestogen is mifepristone.

Medical termination of pregnancy: mifepristone (partial agonist) combine with prostaglandin (e.g., gemeprost).