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The hormones in the pill have also been used to treat other medical conditions, such as polycystic ovary syndrome (PCOS), endometriosis, adenomyosis, acne, hirsutism, amenorrhea, menstrual cramps, menstrual migraines, menorrhagia (excessive menstrual bleeding), menstruation-related or fibroid-related anemia and dysmenorrhea (painful menstruation).
Hormonal contraception is highly effective: when taken on the prescribed schedule, users of steroid hormone methods experience pregnancy rates of less than 1% per year. Perfect-use pregnancy rates for most hormonal contraceptives are usually around the 0.3% rate or less. [2]
Other research has found that the rate of VTE is 1 to 5 in 10,000 woman-years in women who are not pregnant or taking a birth control pill, 3 to 9 in 10,000 woman-years in women who are on a birth control pill, 5 to 20 in 10,000 women-years in pregnant women, and 40 to 65 in 10,000 women-years in postpartum women. [104]
Two types of female oral contraceptive pill, taken once per day, are widely available: The combined oral contraceptive pill contains estrogen and a progestin; colloquially known as "the Pill". The progestogen-only pill, colloquially known as "minipill". For perfect use it is 99% effective and typical use is 91% effective.
All contain an estrogen, ethinylestradiol or mestranol, [1] [2] in varying amounts, and one of a number of different progestogens. (Regarding the estrogen, the inactive 3-methyl ether of ethinylestradiol, which must be metabolized by the liver into the active ethinylestradiol; 50 μg of mestranol is equivalent to only 35 μg of ethinylestradiol and should not be used when high-dose [50 μg ...
[126] [127] [124] Women who are not on a birth control pill or hormone therapy have a risk of VTE of about 1 to 5 out of 10,000 women per year. [126] [127] [116] [124] In women taking a birth control pill containing ethinylestradiol and a progestin, the risk of VTE is in the range of 3 to 10 out of 10,000 women per year.
The balance between the two hormones shifts, too. “Before menopause, the main hormone is estrogen, and after menopause, androgens like testosterone become more prevalent,” Stanhiser says.
They work by mainly suppressing luteinising hormone (LH) and follicle-stimulating hormone (FSH) and in turn preventing ovulation. [1] The pill, patch, and vaginal ring are all about 93% effective with typical use. [5] Beneficial health effects include reduced risks of ovarian, endometrial and colorectal cancers.