네스토론

Breast Feeding; Lactation; Milk, Human; Contraceptive Agents, Female

FDA approved drugs -> Active ingredient

FDA approved drugs -> Active ingredient

This chemical does not meet GHS hazard criteria for 50% (1 of 2) of reports.

Warning

H351 (50%): Suspected of causing cancer [Warning Carcinogenicity]

P203, P280, P318, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 2 reports by companies from 2 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Segesterone acetate suppresses ovulation. In a Phase I randomized, placebo-controlled, randomized crossover study involving healthy adult female subjects, there was no clinically significant QTc interval prolongation following a single intravenous bolus dose of segesterone acetate. Segesterone acetate shows no androgenic, anabolic, or estrogenic activity. It also did not show uterotropic activity in ovariectomized rats. In the endometrial transformation test to assess the progestational activity, dose-dependent increases in both uterine weight was observed following subcutaneous administration of segesterone acetate.

Segesterone acetate selectively binds to the progesterone receptor (PR), a transcription factor belonging to the nuclear receptor superfamily, where it acts as an agonist and transactivator. According to the findings from docking experiments, it adopts the same docking position within the PR ligand-binding domain (LBD) as progesterone but due to additional stabilizing contacts between 17α-acetoxy and 16-methylene groups and PR LBD, segesterone acetate display higher potency than progesterone. As with other progestins, segesterone acetate prevents ovulation by blocking the midcycle surge in luteinizing hormone (LH) secretion, thereby inhibiting the development of ovarian follicles. When used in combination with segesterone acetate, ethinyl estradiol potentiates the antigonadotropic of the progestin and prevents irregular shedding of the endometrium. Segesterone acetate lacks androgenic activity, and displayed binding affinity to androgen receptors that was 500- to 600-fold less than that of testosterone. It does not display binding affinity toward estrogen receptors. When the relative binding affinities of segesterone acetate to human steroid receptors were investigated _in vitro_, it was demonstrated that segesterone acetate binds to the glucocorticoid receptor. However, segesterone acetate did not exert any glucocorticoid activity in the _in vivo_ assays showing no increase in liver glycogen and tyrosine transaminase TAT.