Like all medicines, ellaOne® can cause side effects, although not everyone gets them.
The most commonly reported side effects were headache, nausea (feeling sick), abdominal pain and painful periods. These are also possible signs of pregnancy. If you miss your period or your period is lighter or heavier than normal, and you experience such symptoms after taking ellaOne®, you should do a pregnancy test.
It is possible that your period may be delayed for more than 7 days of the expected time, after taking ellaOne®. If this happens, or you are in any doubt, it is recommended you take a pregnancy test.
If you get any side effects, talk to your pharmacist or other healthcare professional.