Can u explain how medroxy progesterone tablet taken cyclically for a irregular cycle of perimenopausal dub?

It helps: The lining of the uterus to stabilize, so the bleeding usually stops while a woman is taking the tablets daily. Once a woman stops the Progesterone that signals the lining of the uterus to shed. So usually 2-5 days after stopping the medication the period starts. After a cycle or two the periods become shorter lighter and regular. Taking Progesterone cyclically helps the period to be regular.