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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.
Norethisterone has an elimination half-life of 5.2 to 12.8 hours, with a mean elimination half-life of 8.0 hours. [9] The metabolism of norethisterone is very similar to that of testosterone (and nandrolone) and is mainly via reduction of the Δ 4 double bond to 5α- and 5β-dihydronorethisterone, which is followed by the reduction of the C3 ...
Progestogen-only injectable contraceptives (POICs) are a form of hormonal contraception and progestogen-only contraception that are administered by injection and providing long-lasting birth control. [ 2 ] [ 3 ] As opposed to combined injectable contraceptives , they contain only a progestogen without an estrogen , and include two 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, respectively.
These include the 19-nortestosterone derivatives norethisterone, noretynodrel, and tibolone, as well as the norethisterone prodrugs [251] norethisterone acetate, norethisterone enanthate, lynestrenol, and etynodiol diacetate. [1] The estrogenic activity of norethisterone and its prodrugs are due to metabolism into ethinylestradiol. [1]
A 2006 study of 124 premenopausal women measured sex hormone-binding globulin (SHBG), including before and after discontinuation of the oral contraceptive pill. Women continuing use of oral contraceptives had SHBG levels four times higher than those who never used it, and levels remained elevated even in the group that had discontinued its use.
Estradiol is an estrogen, or an agonist of the estrogen receptors, whereas norethisterone acetate is a progestin (synthetic progestogen), or an agonist of the progesterone receptors. [14] Relugolix suppresses ovarian sex hormone production , whereas estradiol and norethisterone acetate provide hormonal add-back to reduce hypogonadal and ...
Estradiol valerate/norethisterone enantate (EV/NETE), sold under the brand name Mesigyna among others, ...