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Since 2003, brands of birth control pills have been available in 84-day regimens for what's known as extended-cycle oral contraception. It is possible to reduce the number of menstrual periods a woman has in a year or even to eliminate them all together. With pills containing continuous hormone, there isn't any scheduled time of bleeding, but spotting or unexpected bleeding may occur. The progestin-only pills come in 28-day packs with all the pills being active containing hormone. By taking reminder pills, a woman takes a pill each day, which can help maintain her birth control regimen. In the 28-day pack, typically 21 pills are active pills containing hormones and the other pills are "reminder" pills without hormones. Then a new pack is started on the same day of the week as the start of the previous pack. This will be like a regular menstrual period but generally lighter. After finishing the 21 day pack, there is a week without any pills when The various brands of combination birth control pills generally come packaged in blister packs containing 21 or 28 tablets. They are also suitable for women who are breastfeeding because they don't interfere with the production of milk. Sometimes referred to as "minipills," progestin-only pills are especially useful for women who cannot take estrogens. There are some birth control pills that are progesterone-only pills. Combination oral contraceptives are birth control pills that contain both ingredients. The active ingredients in birth control pills are synthetic versions of the female hormones estrogen and progesterone. What are the different types of birth control pills?