The Emergency Contraceptive Pill (ECP) is a form of female contraception that can be used after unprotected sex. This page explains how the ECP works and tells you how to use it.
What is the Emergency Contraceptive Pill (ECP)?
The ECP is taken after unprotected sex to prevent pregnancy.
It stops or delays the release of an egg from your ovaries until the guy’s sperm aren’t active in your body any more.
It prevents the sperm from fertilising an egg by changing the way the sperm moves in your body.
It doesn’t work once the egg has been fertilised.
It doesn’t harm you or a developing embryo.
When can I take the ECP?
The ECP is approved to be taken up to 72 hours after sex (three days). However for most women it is still effective up to four days after sex.
How effective is it?
It has a success rate of 98% for women of average weight when taken within four days of unprotected sex.
The ECP is not as effective for women who weigh more than 70kg and for these women a copper IUD is recommended. If you decide you want to take the ECP, you should take a double dose - two ECPs together.
Tell your doctor or pharmacist about any other medication you are taking as you may need extra ECPs or a copper IUD. If you vomit within three hours of taking the ECP you’ll need to get another one.
An alternative method of emergency contraception is the copper IUD. It is inserted by a doctor or trained nurse up to five days after the egg is released, and it’s almost 100% effective.
It has the advantage of providing long-term contraception and being effective for heavier women.
Does the ECP have any side effects?
A few women have mild side effects e.g. feel sick or vomit. You can take the ECP with food to lessen the chance you will feel sick.
There is a very small risk of an ectopic pregnancy (pregnancy outside the womb) if the ECP fails. This can occur with any pregnancy and can be dangerous. If you have cramping or bleeding, see a doctor, or go back to the clinisc
If you think you could be pregnant/hapū, have a pregnancy test three to four weeks after you use the ECP.
Can I get the ECP in advance?
Yes, you can buy it from a chemist or get it from our clinics or your doctor on prescription.
You can have it at home just in case and having it handy means you can take it as soon as you realise there is a problem.
What else should I know about the ECP?
- It contains progestogen, which is a very safe hormone.
- It doesn't make it harder for you to get pregnant later on.
- It’s not harmful if you use it more than once.
- It won’t cause an abortion if you are already pregnant.
Can I use the ECP as a regular method of contraception?
No. The ECP is not as effective as other contraceptive methods, doesn’t protect you from sexually transmissible infections (STIs) and doesn’t protect you from pregnancy for future sex, so it’s unwise to use it as a regular method of contraception.
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