On December 7,2011, Health and Human Ser-vices Secretary Kathleen Sebelius overruled the US Food and Drug Administration's (FDA's) decision that levonorgestrel emergency contraception (sold under the brand name Plan B One-Step) was safe and effective for all women of childbearing potential, regardless of their age, and should be approved for sale as a nonprescription drug. Plan B One-Step is a single-dose 1.5-mg tablet of levonorgestrel that should be taken as soon as possible and within 72 hours after an episode of unprotected intercourse.
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机译：2011年12月7日，卫生与人类服务部长凯瑟琳·塞贝留斯（Kathleen Sebelius）否决了美国食品药品监督管理局（FDA）的决定，认为左炔诺孕酮紧急避孕药（以Plan B One-Step商标出售）对所有女性均安全有效。潜在的生育能力，无论年龄大小，均应批准作为非处方药销售。计划B一步是单剂量1.5毫克左炔诺孕酮片，应在无保护的性交发作后的72小时内尽快服用。
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