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Levonorgestrel, also known as 17α-ethynyl-18-methyl-19-nortestosterone or as 17α-ethynyl-18-methylestr-4-en-17β-ol-3-one, is a synthetic estrane steroid and a derivative of testosterone. [ 63 ] [ 64 ] It is the C13β or levorotatory stereoisomer and enantiopure form of norgestrel , the C13α or dextrorotatory isomer being inactive.
Extended cycle use of COCPs may also be called menstrual suppression, [2] although other hormonal medications or medication delivery systems (hormonal intrauterine devices—IUDs) may also be used to suppress menses. Any brand of combined oral contraceptive pills can be used in an extended or continuous manner by simply discarding the placebo ...
The ovulation-inhibiting dosage of levonorgestrel, which is twice as potent as norgestrel, is approximately 50 to 60 μg/day. [6] [18] [17] One review lists the ovulation-inhibiting dose of norgestrel as 100 μg/day. [19]
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 ...
The Yuzpe regimen is a method of emergency contraception that uses a combination of ethinyl estradiol and levonorgestrel, specifically 1 mg of norgestrel (or 0.50mg of levonorgestrel) and 100 mcg of ethinyl estradiol ASAP and again in 12 hrs.
For the first 21 days of the cycle, users take a daily pill that contains two hormones, estrogen and progestogen. During the last 7 days of the cycle, users take daily placebo (biologically inactive) pills and these days are considered hormone-free days. Although these are hormone-free days, users are still protected from pregnancy during this ...
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The rate of amenorrhea after one year of use is in the range of 20 to 50%, although most users of the hormonal IUDs Mirena and Liletta experience a marked decrease in menstrual bleeding, which is beneficial and has led to reported high rates of user satisfaction. Levonorgestrel IUDs have also been used been shown to induce amenorrhea.
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