Article Text

Download PDFPDF
The preparations


The various progestagens used differ in potency, but their potency ratios in humans are not precisely known because different assay methods give different results. Nevertheless for clinical purposes the rank order of milligram potency seems to be approximately as follows: norethisterone and ethynodiol (most potent), norethynodrel, lynoestrenol, megestrol acetate (least potent).

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.