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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.
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 ...
In comparison, oral contraceptives can contain 150 micrograms of levonorgestrel. [53] The hormonal IUD releases the levonorgestrel directly into the uterus, as such its effects are mostly paracrine rather than systemic. Most of the drug stays inside the uterus, and only a small amount is absorbed into the rest of the body. [53]
Emergency contraception (EC) is a birth control measure, used after sexual intercourse to prevent pregnancy.. There are different forms of EC. Emergency contraceptive pills (ECPs), sometimes simply referred to as emergency contraceptives (ECs), or the morning-after pill, are medications intended to disrupt or delay ovulation or fertilization, which are necessary for pregnancy.
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