Levonorgestrel (sometimes known as the branded Levonelle) must be taken within 72 hours (3 days) of unprotected sex.
ellaOne must be taken within 120 hours (5 days) of unprotected sex.
Both pills are most effective when taken as soon as possible after unprotected sex.
Both Levonorgestrel and ellaOne can be taken more than once during your menstrual cycle.