The effectiveness of emergency contraception is dependent on certain factors including the period of time that has passed since sexual intercourse.

Levonelle will only work when taken within 72 hours of sexual intercourse. It is 95% effective when taken within 12 hours of intercourse but only 58% effective if taken between 48-72 hours after having sex as effectiveness decreases with time.

EllaOne is 95% effective when taken up to 5 days (120 hours) after sexual intercourse.

Authored Dec 22, 2017 by Joseph Isaac, MPharm
Reviewed Dec 04, 2018 by Prabjeet Saundh, MPharm

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