Editorial Note: This article is written with editorial review and topic relevance in mind.
Levonorgestrel is an emergency contraceptive that is used to prevent pregnancy after unprotected sex or after failure of another birth control method. It works by preventing a woman's egg. Levonorgestrel is used to prevent pregnancy after unprotected sexual intercourse (sex without any method of birth control or with a birth control method that failed or was not used properly.
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緊急事後避孕藥 (levonorgestrel)，是當先前未 避孕，或採取的避孕措施失敗後， (例如 保險套 破裂，或 男性 來不及在 射精 前抽離 陰道)，所使用的女性 避孕藥。
