How do advanced OCPs work

An advanced oral contraceptive pill usually contains two hormones, progestin (desogestrel 150 mcg) and estrogen (ethinylestradiol 30 mcg). This combined OCP works mainly by preventing the release of an egg (called ovulation) during the menstrual cycle. It also makes vaginal mucus thicker to help prevent sperm from reaching an egg (called fertilization) and changes the lining of the uterus to prevent attachment of a fertilized egg. If an egg does become fertilized, it is unable to attach to the uterus and passes out of the body.

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