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CPA/EE-containing birth control pills were developed by 1975 [20] [21] and were first introduced for medical use in 1978. [22] They originally contained 50 μg EE (Diane); subsequently, the EE dosage was decreased to 35 μg in a new "low-dose" preparation in 1986 (Diane-35).
All contain an estrogen, ethinylestradiol or mestranol, [1] [2] in varying amounts, and one of a number of different progestogens. (Regarding the estrogen, the inactive 3-methyl ether of ethinylestradiol, which must be metabolized by the liver into the active ethinylestradiol; 50 μg of mestranol is equivalent to only 35 μg of ethinylestradiol and should not be used when high-dose [50 μg ...
Estradiol, mainly as esters including estradiol valerate, estradiol cypionate, and estradiol enanthate, is also the exclusive estrogen used in combined injectable contraceptives. [6] As of 2021, more than 95% of prescriptions are for combined hormonal birth control forms containing the synthetic estrogen ethinylestradiol (EE). [7]
Estradiol-containing birth control pills were initially studied in the 1970s, with the first report published in 1977. [230] [231] Development of birth control pills containing estradiol was motivated by the thrombotic risks of ethinylestradiol that were uncovered in the 1960s and 1970s.
Cyproterone acetate (CPA), sold alone under the brand name Androcur or with ethinylestradiol under the brand names Diane or Diane-35 among others, is an antiandrogen and progestin medication used in the treatment of androgen-dependent conditions such as acne, excessive body hair growth, early puberty, and prostate cancer, as a component of feminizing hormone therapy for transgender individuals ...
These differences make EE more favorable for use in birth control pills than estradiol, though also result in an increased risk of blood clots and certain other rare adverse effects. [7] EE was developed in the 1930s and was introduced for medical use in 1943. [13] [14] The medication started being used in birth control pills in the 1960s. [15]
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