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Norgestrel

炔諾孕酮
Mechanism of action:
Norgestrel 是一種合成黃體素(synthetic progestin),為 19-去甲睪酮(19-nortestosterone)衍生物。Norgestrel 透過負回饋作用抑制下視丘-腦下垂體-性腺軸(hypothalamic-pituitary-gonadal axis),降低黃體成長激素(LH)峰值的產生,使卵泡無法正常破裂,從而抑制或延遲排卵。Norgestrel 也會使子宮頸黏液變得濃稠,阻礙精子通過子宮頸進入子宮腔,降低受精可能性。此外,norgestrel 能使子宮內膜維持在較薄、非增生狀態,即使受精發生,也不利於胚胎著床。
Reference(s):
1. Hammond GL et al. (2001). Preclinical profiles of progestins used in formulations of oral contraceptives and hormone replacement therapy. Am J Obstet Gynecol.
2. Rabe T et al. (2000). Inhibition of skin 5 alpha-reductase by oral contraceptive progestins in vitro. Gynecol Endocrinol.
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