Any medicine can come with potential side effects but these will vary from person to person. Generally, the morning after pill is very well-tolerated. The most common side effects are headaches, nausea (feeling sick), abdominal pain, fatigue, dizziness and painful periods, but everyone is different.
ellaOne® contains ulipristal acetate which will affect the hormones that control ovulation in your current menstrual cycle. This means it can change the date your next period arrives, or make it heavier or lighter than usual. By your next menstrual cycle everything will return to its usual pattern. We recommend using a barrier method of contraception – like a condom or diaphragm – until your next period arrives. If your next period is more than 7 days late, if your period is abnormal in character or if there are symptoms suggestive of pregnancy or in case of doubt, you should take a pregnancy test.