A term applied to any substance possessing progestational activity. Any of several steroid hormones (including progesterone) that prepare the uterus for egg implantation, maintain pregnancy, and prevent further ovulation during pregnancy.
An umbrella term applied to any substance possessing progestational activity. A steroid hormone (including progesterone) that induces changes in the endometrium after priming with estrogens. There can be substantial differences between progestogens, both in chemical structure and in pharmacological profile.