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Levonorgestrel is a hormonal medication which is used in a number of birth control methods. [3] [7] It is combined with an estrogen to make combination birth control pills. [8]As an emergency birth control, sold under the brand names Plan B One-Step and Julie, among others, it is useful within 72 hours of unprotected sex.
Norethisterone acetate (NETA), also known as norethindrone acetate and sold under the brand name Primolut-Nor among others, is a progestin medication which is used in birth control pills, menopausal hormone therapy, and for the treatment of gynecological disorders.
Norethisterone was discovered in 1951 and was one of the first progestins to be developed. [19] [20] [21] It was first introduced for medical use on its own in 1957 and was introduced in combination with an estrogen for use as a birth control pill in 1963. [21] [22] It is sometimes referred to as a "first-generation" progestin.
1000 μg norethisterone acetate (UK: Loestrin 20, Galen; US: Loestrin 1/20, Duramed; Microgestin 1/20, Watson Pharmaceuticals; Junel 1/20, Barr) 1000 μg norethisterone acetate: 24 days + 4 days ferrous fumarate only (US: Loestrin 24 Fe, Warner Chilcott) 90 μg levonorgestrel: continuous: 365 days/year, no placebo (US: Amethyst, Watson)
Norgestrel is a progestogen, or an agonist of the progesterone receptor. [6] The biological activity of norgestrel lies in the levo enantiomer, levonorgestrel, whereas the dextro isomer is inactive. [6]
Estradiol cypionate 5 mg + levonorgestrel butanoate 7 mg in an aqueous suspension [16] Estradiol benzoate 5 to 10 mg + norethisterone enanthate 50 to 100 mg [62] Mestranol 1.0–1.2 mg + norethisterone 10–12 mg in a microcrystalline aqueous suspension of defined particle sizes (125–177 μm) [25] [16] [62] [32] Ethinylestradiol ...
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 ...
Estradiol valerate/norethisterone enantate (EV/NETE), sold under the brand name Mesigyna among others, is a form of combined injectable birth control which is used to prevent pregnancy in women.