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Individual differences |
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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
Progestagens (also spelled progestogens or gestagens) are hormones which produce effects similar to progesterone, the only natural progestagen. All other progestogens are synthetic and are often referred to as progestins..
Progestogens differ in their potency (affinity for progesterone receptors) and side effects. Such side effects may be androgenic (medroxyprogesterone and most C19 progestagens), antiandrogenic (cyproterone acetate), estrogenic, glucocorticoid (some C21 progestogens) or antimineralocorticoid (progesterone).
- Most progestogens are used for their antiestrogenic properties in combined (including estrogen) methods of hormonal contraception to avoid overstimulation of the endometrium which could lead to endometriosis and cancer.
- Medroxyprogesterone acetate (brand name Depo Provera) is used by depot injection.
- Etonogestrol is released by subcutaneous implants (Implanon). Similar products (Norplant and Jadelle contain Levonorgestrel.
Progestogen withdrawal bleedingEdit
In a normal menstrual cycle, a sudden drop in progesterone levels triggers menstruation. Norethindrone acetate (brand name Aygestin) and medroxyprogesterone acetate (brand name Provera) may be used to artificially induce progestogen withdrawal bleeding.
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