Medically reviewed by Anita Sadaty, MD Progesterone is a naturally occurring hormone that helps prepare the lining of your uterus for pregnancy. Progestin is any natural or man-made substance that has ...

Third-generation oral contraceptives are an association ... MR = Mineralocorticoid receptor; PR = Progesterone receptor. The relative binding affinity (%) of the main progestins discussed in ...

Generations are not standardized ... derived from 17-α-spirolactone and pharmacologically resembling endogenous progesterone. It has both antiandrogenic and antimineralocorticoid activities.