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USA TodayBy year's end, U.S. women will have two types of emergency contraceptive pills to choose from.
Studies show that both of them effectively prevent pregnancy after contraceptive failure or unprotected sex, but two major differences distinguish them: Only one is available without a prescription. The other is effective longer.
The Food and Drug Administration approved Ella, which contains a compound called ulipristal, in August. Watson Pharmaceuticals says it will launch Ella before the end of the year.
Its competitors: Plan B One-Step and Next Choice, which contain levonorgestrol. The original Plan B, two pills taken 12 hours apart, won FDA approval in 1999. Last year, Teva Pharmaceuticals introduced Plan B One-Step, a single pill, and Watson introduced Next Choice, a generic version of the original two-step Plan B.
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http://www.usatoday.com/yourlife/health/medical/womenshealth/2010-09-28-Morningafter28_ST_N.htm