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Levonorgestrel-only emergency contraceptive pills are reported to have an 89% effectiveness rate if taken within the recommended 72 hours after sex. [38] The efficacy of the drug decreases by 50% for each 12-hour delay in taking the dose after the emergency contraceptive regimen has been started. [38]
The World Health Organization (WHO) does not recommend the use of combined oral contraceptive pills in women with breast cancer. [41] [97] Since combined oral contraceptive pills contain both estrogen and progestin, they are not recommended to be used in those with hormonally-sensitive cancers, including some types of breast cancer.
Between 2015 and 2017, 64.9% of women ages 15–49 in the United States were using contraception, and of those 12.6% were using the oral contraceptive pill. [46] There are approximately 100 million users of combined oral contraceptives worldwide, with use being more common in Western Europe, Northern Europe, and the United States. [47]
Progestins in birth control pills are sometimes grouped by generation. [ 239 ] [ 240 ] While the 19-nortestosterone progestins are consistently grouped into generations, the pregnane progestins that are or have been used in birth control pills are typically omitted from such classifications or are grouped simply as "miscellaneous" or "pregnanes".
Perfect use" means that an individual uses their contraceptive pill at the same time every day without missing a scheduled dose. [ 21 ] Assuming "typical use," the theoretical efficacy of progestogen-only pills in avoiding undesired pregnancy falls to around 91-93%, meaning that approximately 7 to 9 out of every 100 patients will experience an ...
Dienogest is used primarily in birth control pills in combination with ethinylestradiol under the brand name Valette. [24] [7] [25] It is also available in a quadriphasic birth control pill combined with estradiol valerate, marketed as Natazia in the United States and Qlaira in some European countries and Russia. [26] [27] [28]
Over 60 years after it was first introduced on the NHS, the pill is the main form of contraception for nearly a third of women of reproductive age in the UK, and more than 150 million women use it ...
Ethinylestradiol (EE) is an estrogen medication which is used widely in birth control pills in combination with progestins. [7] [8] In the past, EE was widely used for various indications such as the treatment of menopausal symptoms, gynecological disorders, and certain hormone-sensitive cancers.
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