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口服緊急避孕藥72小時前后都管用嗎，常用的緊急避孕藥推薦！

出處：媽媽育兒網(wǎng) 日期：2019-11-22 15:38:54 編輯：小鈺
服用緊急避孕藥是在發(fā)生關(guān)系后防止懷孕的一種避孕措施，那么口服禁忌避孕藥72小時前后都管用嗎，常用的禁忌避孕藥有哪幾種？更多關(guān)于懷孕注意事項的相關(guān)內(nèi)容盡在媽媽育兒網(wǎng)，歡迎繼續(xù)關(guān)注。

口服緊急避孕藥72小時前后都管用嗎？

在72小時之內(nèi)口服緊急避孕藥都是有效的，在性生活72小時以前服用了也是有效的如果已經(jīng)超過了72小時，那么久沒有效果了。
緊急避孕藥只針對這一次性生活是管用的，下次性生活就要再做避孕措施，否則還是會懷孕的。
緊急避孕藥是事后服用的藥物，需要在事后72小時內(nèi)服用，越早服用效果越好，但是如果服藥后，繼續(xù)發(fā)生了性行為，需要重新計算時間。除此之外，緊急避孕藥由于所含的激素過高，一個月內(nèi)最好服用一次，一年不能超過三次。如果多次發(fā)生性行為，最好使用避孕套。
女性經(jīng)常服用避孕藥，有可能會引發(fā)內(nèi)分泌紊亂，引起月經(jīng)不調(diào)，緊急避孕藥作為事后補救的一種措施，可以有效防止妊娠的發(fā)生，但是不是100%，緊急避孕藥中含有大量的雌孕激素，大量的孕激素進入人體后，人體所含孕激素突然增多，模擬了懷孕的環(huán)境，導(dǎo)致不排卵，從而達到避孕的目的。

常用的緊急避孕藥推薦：

1、單方孕激素緊急避孕藥
單方孕激素類緊急避孕藥，成分多為左炔諾孕酮，均為非處方藥。主要有兩種規(guī)格：一種是0.75毫克，單次口服2片，或首次服1片，間隔12小時服第2片；另外一種是1.5毫克，單次口服1片。在無防護性性生活或避孕失敗72小時以內(nèi)，服藥越早，預(yù)防妊娠效果越好。服用前后無需禁食。
這類藥物的避孕機制是顯著抑制排卵和阻止孕卵著床，并使宮頸粘液稠度增加，精子穿透阻力增大，從而發(fā)揮速效避孕作用。
2、抗孕激素緊急避孕藥
抗孕激素類緊急避孕藥的有效成分為米非司酮，為處方藥。用于緊急避孕時，在無防護性性生活或避孕失敗72小時以內(nèi)，空腹或進食2小時以后口服25毫克，服用后禁食1-2小時。
抗孕激素類緊急避孕藥具有終止早孕、抗著床、誘導(dǎo)月經(jīng)及促進宮頸成熟等作用，與孕酮競爭受體而達到拮抗孕酮的作用。服用不同劑量的米非司酮會達到不同的效果：通常情況下，每次服用米非司酮10至25毫克可用于緊急避孕；服用150毫克可終止49天內(nèi)的妊娠。

口服禁忌避孕藥要注意什么？

1、緊急避孕藥只能對前一次性生活有事后避孕作用，服藥后不能再有無防護措施的性交。
2、服藥后有少量陰道出血不是避孕成功的標志，如果沒有月經(jīng)量樣出血，應(yīng)及早到醫(yī)院檢查。
3、服藥后2小時內(nèi)發(fā)生嘔吐，應(yīng)盡快補服1次。
4、緊急避孕藥只能偶爾使用，不能代替常規(guī)避孕方法。
5、已經(jīng)妊娠的婦女禁用緊急避孕藥，因為緊急避孕藥對已經(jīng)確立的妊娠是沒有流產(chǎn)作用的。
6、無保護措施的性生活后，服藥越早，防止非意愿妊娠的效果越好。

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