Medical Encyclopedia
Birth control pill - series: 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.
Update Date: 5/6/2007
Updated by: Rachel A. Lewis, MD, FAAP, Columbia University Pediatric Faculty Practice, New York, NY. Review provided by VeriMed Healthcare Network.
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