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2. Comparison of birth control methods - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_birth...

   There are two different types of emergency contraceptive pills, one contains levonorgestrel and can prevent pregnancy if taken within 3 days of intercourse. The other contains ulipristal acetate and can prevent pregnancy if taken within 5 days of intercourse. This option can be used if other birth control methods fail. [5]

3. Birth control - Wikipedia

   en.wikipedia.org/wiki/Birth_control

   Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [1] [2] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [3]

4. The most common birth control methods and how effective they ...

   www.aol.com/lifestyle/most-common-birth-control...

   Oral contraceptives. There are different forms of oral contraceptives, but this is collectively referred to as "the Pill." How does it work? The Pill uses the hormones progestin and estrogen to ...

5. Combined injectable birth control - Wikipedia

   en.wikipedia.org/wiki/Combined_injectable_birth...

   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. [2]

6. Hormonal contraception - Wikipedia

   en.wikipedia.org/wiki/Hormonal_contraception

   The incidence of certain side effects is different for the different formulations: for example, breakthrough bleeding is much more common with progestogen-only methods. Certain serious complications occasionally caused by estrogen-containing contraceptives are not believed to be caused by progestogen-only formulations: deep vein thrombosis is ...

7. Combined oral contraceptive pill - Wikipedia

   en.wikipedia.org/wiki/Combined_oral...

   The risk of thromboembolism varies with different types of birth control pills; compared with combined oral contraceptives containing levonorgestrel (LNG), and with the same dose of estrogen and duration of use, the rate ratio of deep venous thrombosis for combined oral contraceptives with norethisterone is 0.98, with norgestimate 1.19, with ...