Gynecology and Obstetrics, The Johns Hopkins University, Bayview Medical Center, Baltimore, MD, USA.
Am J Obstet Gynecol. 2011 Oct;205(4 Suppl):S14-7. doi: 10.1016/j.ajog.2011.04.033. Epub 2011 Apr 29.
The progestin component of hormonal contraceptives accounts for most of their contraceptive effects. Several dosage forms of progestin-only contraceptives have been developed, including pills, injectables, implants, and intrauterine devices. Emergency contraceptives may also contain progestin only and are indicated for prevention of pregnancy following unprotected intercourse or contraceptive failure. Each form has benefits, some specific to the form. An understanding of benefits and risks allows clinicians a wider choice when recommending effective hormonal contraception.
激素类避孕药中的孕激素成分是其主要的避孕作用机制。目前已开发出几种孕激素仅避孕药的剂型，包括药丸、注射剂、植入物和宫内节育器。紧急避孕药也可能仅含有孕激素，用于预防无保护性交或避孕失败后的怀孕。每种形式都有其优点，有些优点是该形式特有的。了解其益处和风险可使临床医生在推荐有效的激素避孕方法时有更广泛的选择。
