EllaOne is a morning-after pill that can prevent a pregnancy after unprotected sex, or if your contraceptive method has failed. EllaOne is effective when it matters most because it can prevent a pregnancy even when you are about to ovulate – which is when your risk of getting pregnant is greatest - EllaOne works by delaying egg release. So, by the time an egg is released (ovulation) the sperm inside you are no longer capable of making you pregnant.
EllaOne should be taken as soon as possible, but no later than 5 days (120 hours) after unprotected sex or contraceptive failure.