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EllaOne works to prevent unwanted pregnancies, similar toLevonelle. However, it can provide protection up to 5 days (120 hours)after unprotected sex.
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Levonogestrel (also known as Levonelle) works to prevent unwanted pregnancies if taken within 72 hours of unprotected sex. The sooner it is taken within the 72 hour window, the more effective it will be.