Antiprogestogens are one of three types of sex hormone antagonists, alongside antiestrogens and antiandrogens.

[2][3] In medical abortion, mifepristone is combined with a prostaglandin (e.g., gemeprost), while ulipristal is used for emergency contraception.

[5] Progestins, including progesterone, are vital for preparing the uterus for the implantation of a fertilized egg during the luteal phase of the menstrual cycle.

[4] This article incorporates public domain material from Dictionary of Cancer Terms.

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