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Traditional birth control pills make your reproductive system mimic a regular 28-day monthly cycle. For the first 21 days, you take active pills containing reproductive hormones. For the last seven days, you take a placebo. While you're taking the placebo pills, you bleed vaginally, as if you were having a regular menstrual period.
By contrast, extended-cycle birth control pills contain active hormones for every day of the month. The newest extended-cycle regimen, Lybrel, is a low-dose pill that's designed to be taken continuously for one year, with no breaks for hormone-free intervals. Lybrel is meant to suppress all menstrual bleeding.
Two other specially designed, extended-cycle pill regimens — Seasonal and Seasonique — are also currently on the market. With both pills, you take active hormone pills every day for three months, then you take one week of placebo pills (Seasonale) or low-dose estrogen pills . You'll experience menstrual bleeding during that week.
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