Types
There are two main classes of hormonal contraceptives: combined contraceptives contain both an estrogen (usually ethinyl estradiol) and a progestin. Progestogen-only contraceptives contain only progesterone or a synthetic analogue (progestin). Also marketed is ormeloxifene; while not a hormone, ormeloxifene acts on the hormonal system to prevent pregnancy.
Read more about this topic: Hormonal Contraception
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