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Progesterone (P4), sold under the brand name Prometrium among others, is a medication and naturally occurring steroid hormone. [20] It is a progestogen and is used in combination with estrogens mainly in hormone therapy for menopausal symptoms and low sex hormone levels in women.
It contains estradiol cypionate (EC), an estrogen, and medroxyprogesterone acetate (MPA), a progestin. [2] It is recommended for short-term use and is given once a month by injection into a muscle. [3] Common side effects of EC/MPA include irregular menstrual periods which typically improves with time. [3]
Adverse effects can also occur in the urinary, central or peripheral nervous, or musculoskeletal systems. [35] A review of clinical trials studying bioidentical progesterone use found that it was ineffective in managing vasomotor symptoms of menopause, but had mild and self-limiting side effects. [36]
"The primary treatment — and the first-line treatment — should be hormone (estrogen) therapy, especially for moderate-to-severe menopause symptoms," Dr. Anna Barbieri, assistant clinical ...
[84] [85] [86] The preceding side effects of synthetic estrogens do not appear to occur in pregnant women, who already have very high estrogen levels. [84] This suggests that these effects are due to estrogenic activity. [84] Synthetic estrogens have markedly stronger effects on the liver and hepatic protein synthesis than natural estrogens.
However, typical use of combined oral contraceptive pills by users often consists of timing errors, forgotten pills, or unwanted side effects. With typical use, the estimated risk of getting pregnant is about 9% which means that about 9 in 100 women on combined oral contraceptive pills will become pregnant in one year. [41]