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Levonorgestrel pills, when used within 3 days, decrease the chance of pregnancy after a single episode of unprotected sex or condom failure by 70% (resulting in a pregnancy rate of 2.2%). [11] Ulipristal , when used within 5 days, decreases the chance of pregnancy by about 85% (pregnancy rate 1.4%) and is more effective than levonorgestrel.
In comparison, venous thromboembolism occurs in 100–200 per 100.000 pregnant women every year. [115] One study showed more than a 600% increased risk of blood clots for women taking COCPs with drospirenone compared with non-users, compared with 360% higher for women taking birth control pills containing levonorgestrel. [116]
Oral contraceptives, abbreviated OCPs, also known as birth control pills, are medications taken by mouth for the purpose of birth control. The introduction of the birth control pill ("the Pill") in 1960 revolutionized the options for contraception, sparking vibrant discussion in the scientific and social science literature and in the media.
Currently, there are many different brands of levonorgestrel EC pills, including Take Action, Next Choice One Dose, and My Way and regimens include a single 1.5 mg pill of levonorgestrel. [41] Levonorgestrel EC pills should be taken up to 72 hours after unprotected sex due to the drug becoming less effective over time. [41]
In the UK, one survey demonstrated that in 2010–2012, more than 33% of women aged 16–44 years had used oral contraception in the previous year and that it was mostly the combined type. [1] Between 2006 and 2010 only 10% of women in the US had used the contraceptive patch, and 6% had used the vaginal ring.
CICs are different from progestogen-only injectable contraceptives (POICs), such as depot medroxyprogesterone acetate (DMPA; brand names Depo-Provera, Depo-SubQ Provera 104) and norethisterone enantate (NETE; brand name Noristerat), which are not combined with an estrogen and are given once every two to three months instead of once a month.
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Contraception means prevention of reproduction by artificial means. Before the advent of modern contraceptives, reproductive age women spent most of their time either pregnant or nursing. In modern Western society, women typically have about 450 periods during their lives, as compared to about 160 formerly. [7]
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