Buy this pill for future use. Most effective when taken within 3 days (72 hours).
This is a single pill that contains 1.5 milligrams of levonorgestrel, a synthetic form of the hormone progesterone. It’s effective in preventing pregnancy if taken within 3 days (72 hours) of a pregnancy risk but becomes less effective the longer you wait to take it.
How does the emergency contraceptive pill work?
The hormones in emergency contraception pills change the hormone levels in the body and delay ovulation (when the ovary releases an egg). This is the time in your cycle when you’re most likely to get pregnant.
It’s important to delay ovulation after unprotected sex because:
- sperm can live in the uterus and fallopian tubes for up to 5 days, so if you have unprotected sex just before ovulation there could be sperm there already and it could fertilise an egg as soon as you ovulate
- as the egg can be fertilised for 2 days after ovulation, if you delay it, the sperm are more likely to die before the egg’s released
What if you’ve already ovulated?
If you’ve already ovulated, then the emergency contraceptive pills will have no effect.
However, even if you think you ovulated more than 5 days ago, we recommend using emergency contraception no matter where you are in your cycle because it’s difficult to predict the exact time of ovulation.
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