左炔诺孕酮(计划B® 或同等学名药)是一种仅含孕激素的紧急避孕药,用于在发生性行为 后防止怀孕。片剂(丸剂)应尽快服用,最好在最后一次性接触后24 小时内服用。它在发 生性行为后5 天(120 小时)内有效,但随着时间的推移,效果会降低。
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