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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.
Norethisterone and ethinylestradiol levels over 24 hours after a single oral dose of 10 mg NETA in postmenopausal women. [ 25 ] NETA metabolizes into ethinylestradiol at a rate of 0.20 to 0.33% across a dose range of 10 to 40 mg. [ 26 ] [ 27 ] Peak levels of ethinylestradiol with a 10, 20, or 40 mg dose of NETA were 58, 178, and 231 pg/mL ...
Norethisterone enanthate (NETE), also known as norethindrone enanthate, is a form of hormonal birth control which is used to prevent pregnancy in women. [ 1 ] [ 2 ] [ 3 ] It is used both as a form of progestogen-only injectable birth control and in combined injectable birth control formulations.
Formulations and brand names of norethisterone and esters ; Composition Dose Brand names Use NET only: Low (e.g., 0.35 mg) Multiple [a]: Progestogen-only oral contraceptive: NET or NETA only
Mestranol/norethisterone (brand names Norethin, Noriday, Norinyl, Norquen, Ortho-Novum, others) is a combination of the estrogen ethinylestradiol and the progestin norethisterone (norethindrone) which was introduced in 1963 and was the second combined oral contraceptive to be marketed, following mestranol/noretynodrel in 1960. [1]
In 2022, the combination of ethinylestradiol with norethisterone or with norethisterone acetate was the 80th most commonly prescribed medication in the United States, with more than 8 million prescriptions. [5] [6] It is available as a generic medication. [7]
Norethisterone acetate oxime (developmental code names ORF-5263, So-36), or norethindrone acetate oxime, is a steroidal progestin of the 19-nortestosterone group which was developed as a postcoital contraceptive but was never marketed. [1]
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.