Most oral contraceptives contain a combination of 2 types of hormones: an estrogen and a progestin. Both of these hormones are naturally found in women’s bodies. There are many different types of estrogens and progestins, and different types of pills contain different combinations, but they all work similarly. Some pills contain only progestin, sometimes called the mini-pill. Oral contraceptives are usually prescribed for 4 weeks at a time, with each 4-week packet containing 4 to 7 days of hormone-free pills. Women get their period during these hormone-free days. Some preparations have extended or continuous hormone dosing with fewer or no hormone-free days so that women get their periods less than once a month.
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Women's Health and Complications 