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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.
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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 ...
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 ...
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 ...
Oral contraceptives, abbreviated OCPs, also known as birth control pills, are medications taken by mouth for the purpose of birth control.The introduction of the birth control pill ("the Pill") in 1960 revolutionized the options for contraception, sparking vibrant discussion in the scientific and social science literature and in the media.
levonorgestrel 52 mg levonorgestrel 19.5 mg levonorgestrel Initial amount released None 20 μg/day 14 μg/day 18.6 μg/day 16 μg/day Approved effectiveness 10 years (12 years) 5 years (10 years) 3 years 3 years (5 years) 5 years Mechanism of action Copper toxic to sperm -Levonorgestrel thickens cervical mucus to prevent sperm from reaching egg
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