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長效、短效、緊急避孕藥什么時候吃有效？(2)

出處：媽媽育兒網(wǎng) 日期：2013-02-17 13:35:50 編輯：Chen

2、緊急避孕藥

主要成分是孕激素。藥物作用原理和短效避孕藥基本一致。適用于40歲以下女性。主要有毓婷、諾爽、保仕婷及米非司酮片。一般是房事后72小時內(nèi)服第一片，12小時后再服1片，越早服用效果越好。

3、長效避孕藥

一般在月經(jīng)來潮后，第五天服1片，20天以后再服1片。含人工合成的孕激素和長效雌激素。藥物進入人體后，會儲存在脂肪組織內(nèi)，以后緩慢地釋放出來，抑制排卵，起長效避孕作用。適用于不能放置宮內(nèi)節(jié)育器，又不愿采用其他避孕方法的婦女。


 

還可按情況選服避孕藥，各種避孕藥服用的時間是：

1、夫妻在一起，生活有規(guī)律，可堅持每日口服者，選服用短效口服避孕藥，如口服避孕藥1號、2號;從月經(jīng)的第五天開始服用，每日一片，連服22天即可。

2、夫妻在一起，生活無規(guī)律，不能堅持每日口服，可選用長效口服避孕藥，如復方18甲基炔諾酮，從月經(jīng)的第五天服一次藥，間隔20天服第二次，以后每月服一次，每次一片即可。

3、夫妻兩地分居。探親時，可服探親避孕藥，如探親片1號等;房事前8小時服一片，再每晚服1片，直到探親結(jié)束，次晨再服一次，它不適長期使用。

4、口服避孕藥引起胃腸不適的女性，可選避孕針。

5、發(fā)現(xiàn)其它避孕失敗，或被強奸者，可在24小時內(nèi)口服事后避孕藥，如乙烯雌酚50毫克，連用五天。

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