The 'morning-after' pill: A guide

Plan B emergency contraception may soon be available to young teens without a prescription. Is that wise?

Plan B
(Image credit: Justin Sullivan/Getty Images)

What is emergency contraception?

It's a means for preventing pregnancy after an episode of unprotected sex or sexual assault. Throughout the ages, women have resorted to various ineffective — and often desperate — methods to avoid pregnancy, from postcoital douching with Coca-Cola to drinking hot mercury. The search for a safer, more effective "morning-after" pill can be traced back to the 1920s, when veterinarians realized that a dose of estrogen could prevent pregnancy in female dogs and horses who had mated against their owners' wishes. Doctors adopted the use of estrogen to prevent pregnancy in a 13-year-old rape victim in the 1960s, and by the 1970s, oral contraceptive pills that combined estrogen with certain progestin hormones were used "off-label" as morning-after pills. In 1997, the Food and Drug Administration approved the first morning-after pill created for that purpose. In subsequent years, studies suggested that large doses of estrogen could raise the risk of cancer, so progestin-only forms of the pill were then developed — including Plan B, which was approved by the FDA in 1999.

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