ellaOne® delays ovulation when it matters most

Proportion of cycles in which follicular rupture was inhibited for at least 5 days

Ovulation is a result of a surge in luteinising hormone (LH). ellaOne® delays ovulation by inhibiting or delaying the LH surge.1


If the woman is due to ovulate tomorrow or the next day after unprotected sex, when the risk of pregnancy is highest, only ellaOne® can delay ovulation.1


This is when LH has started to surge but has not yet reached the peak. At this time, levonorgestrel will not prevent the follicle from rupturing whereas ellaOne® is highly effective.1

Intake after LH surge, but before peak1



If she is due to ovulate 3 or more days after unprotected intercourse, both ellaOne and levonorgestrel can delay ovulation .1 However, ellaOne® remains more effective in preventing follicle rupture and therefore unintended pregnancy 1.


Intake before LH surge1



If the woman has already ovulated, or is due to ovulate, in the immediate 24 hours of unprotected intercourse, no emergency contraceptive pill help1


This is because the LH has already peaked, meaning the ovulation process is at a point where it cannot be stopped, or has already happened.

This explains why:

• Speed of emergency contraceptive pill intake is critical
• Emergency contraception is not 100% effective

Intake after LH surge 1



ellaOne® can delay ovulation even when it is about to happen (when risk of fertilisation is highest)1





1. Brache V et al. Contraception 2013; 88(5): 611-618.

2. Glasier AF et al. The Lancet 2010; 375: 555-562.