The degree of emergency contraceptive effectiveness
depends on what kind of contraceptive is taken and how quickly it was taken after
unprotected sex. In general, pills that contain only progestin are more effective than
combined emergency pills. Plan B One Step and Next Choice
are examples of emergency contraceptives that contain only progestin. Pills
that contain an antiprogestin are more effective than progestin-only pills. Ella would
be an example of this type of pill.
"Combined pills"
contain both progestin and estrogen and they reduce the risk of pregnancy by 75%.
Progestin-only emergency contraceptive pills that are taken within the first 24 hours
after sex reduce the risk of pregnancy by up to 95%. Emergency contraceptives are safe
and effective but not as effective as birth control used before or during sex, such as
the birth control pill or condoms.
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