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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]
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.
Other combined hormonal contraceptives (those containing both an estrogen and a progestin) may also be used in an extended or continuous cycle. For example, the NuvaRing vaginal ring [4] and the contraceptive patch [5] have been studied for extended cycle use, and the monthly combined injectable contraceptive may similarly eliminate bleeding. [6]
Levonorgestrel emergency contraception has an efficiency rate of 89% if it's used correctly within 72 hours after unprotected intercourse. That means 11 out of 100 people who use it after ...
Norgestimate is a rapidly and completely converted prodrug, mainly of norelgestromin (17β-deacetylnorgestimate or levonorgestrel 3-oxime), but also of levonorgestrel (3-keto-17β-deacetylnorgestimate) to a lesser extent (22 ± 6% of an administered dose or about 40–70 μg) [2] and of levonorgestrel acetate (levonorgestrel 17β-acetate) in ...
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 ...
Levonorgestrel-releasing implant, sold under the brand name Jadelle among others, are devices that release levonorgestrel for birth control. [1] It is one of the most effective forms of birth control with a one-year failure rate around 0.05%. [1] [2] The device is placed under the skin and lasts for up to five years. [3]
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