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。
