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Pills: Hormones
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[I]t is rarely justified to use birth control pills or synthetic hormones. In addition to increasing serious health risks such as blood clots, birth control pills can ... deplete the more important nutrients, including vitamins B2, B6 and B12.
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The first type of emergency contraceptive pill contains a hormone called progestin (learn more about these emergency contraceptive pills). This is the only type of pill available specifically for emergency contraception in the United States (the brand name is Plan B). In other countries, you can find several progestin-only emergency contraceptives and daily birth control pills. Plan B and other progestin-only pills are the most effective emergency contraceptive pills, reducing your risk of getting pregnant by 89% (What does that mean?). You are ... less likely to have side effects if you use these pills for emergency contraception.
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Oral contraceptives are small tablet-form birth control pills taken orally for either 21, 24, 28 days or even longer. They release synthetic hormones that enter the bloodstream, preventing the release of eggs from the ovaries. Every woman's cycle is different, and so are her needs for oral contraceptives. Oral contraceptives must be prescribed by a physician or other healthcare professional.
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There are hormones in each Mini-Pill; there are no spacer pills. It is important to take a pill every day, preferably at the same time each day. Forgetting a Mini-Pill or taking it late increases the chance of pregnancy more than missing a regular birth control pill.
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There are two types of emergency contraceptive pills ("morning after pills"), both of which contain the same kinds of hormones found in many daily birth control pills. You can safely use emergency contraception even if you've been told you shouldn't use "the pill" every day.
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Unlike combination oral contraceptives, progestin-only pills or “POPs” contain no estrogen and have a lower dose of progestin than combined birth control pills. Because they are so low dose, they are sometimes called the “minipill.” Progestin-only oral contraceptives work in 3 different ways: (1) they make the cervical mucus at the entrance to the womb (the uterus) too thick for the sperm to get through to the egg; (2) they prevent ovulation (release of the egg from the ovary) in about half of the users; and (3) they affect other hormones, the fallopian tubes, and the lining of the uterus.
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