URL of this page: //medlineplus.gov/ency/presentations/100108.htm

Birth control pill - series—Progestin in pill

Progestin in pill


The progesterone in birth control pills creates a thick cervical mucus, making it difficult for sperm to reach the uterus. It also impedes an egg from attaching itself to the uterine lining (endometrium) because of changes in the cellular structure of the lining.

Review Date 4/5/2016

Updated by: Irina Burd, MD, PhD, Associate Professor of Gynecology and Obstetrics at Johns Hopkins University School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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