When might Levonelle One Step® not work?

There are some circumstances under which emergency contraceptive pill may not work.

For example if: 

• You have unprotected sex again after taking Levonelle One Step®
• You also had unprotected sex earlier in your menstrual cycle
• You vomit within 3 hours of taking the table. (See Side Effects/Being sick)
• Another medication that you are taking may have made Levonelle One Step® less effective such as anti-epileptic drugs and tuberculosis treatments. 
• You have a medical condition which causes malabsorption, such as Crohn's disease, which you have not discussed when you asked for emergency contraception.

Emergency contraceptive pills will definitely not work if you were already pregnant when you took Levonelle One Step®.

Will Levonelle One Step® emergency contraceptive pills work?