skip to main content
CDHB

Levonorgestrel (Emergency Contraceptive Pill)

lee-voe-nor-jes-trel

What does it do?

The Emergency Contraceptive Pill (ECP) is used to prevent pregnancy after you have had unprotected sex. This includes contraceptive failure such as a condom breaking or missing your regular contraception.
See Sexual Wellbeing Aotearoa for more information.

Before you start

  • Tell your health professional if your last period was more than 5 days late, or if it was light or unusual in any way.
  • Tell your health professional if you are breastfeeding.
  • If you weigh more than 70 kg the ECP may not prevent pregnancy. The most effective emergency contraception is a copper IUD. If this is not an option for you, you will be offered a double dose: two tablets (3 mg) instead of one (1.5 mg).

How should you take it?

Take the ECP as soon as possible (up to 72 hours) after unprotected sex.

Sometimes the ECP can make you feel sick or vomit. Taking it with food may help prevent this. If you vomit or have severe diarrhoea within 3 hours of taking the ECP, you will need to take another dose.

Can you take other medicines?

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort) or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Vomiting or severe diarrhoea

If within 3 hours, you will need to get another dose.

Changes in periods

Nausea, stomach cramps

Sore breasts

Headache, dizziness, tiredness or weakness

Tell your health professional if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Most women should get their next period around the usual time (it might be a few days early or late). Contact your health professional, or do a pregnancy test, if your next period is more than 5 days late, unusual in any way, or if you think you might be pregnant.
  • The ECP is for emergency use only and not suitable for regular contraception. Talk to your health professional about options for regular contraception. If you are already using regular contraception, continue this as normal.
  • The ECP does not protect you from sexually transmitted infections (STIs). If you’ve had unprotected sex, it’s a good idea to get an STI check.
  • Taking the ECP doesn't make it harder to get pregnant if you want to later on.

This leaflet contains important, but not all, information about this medicine.

Prepared by the MyMedicines Committee at Christchurch Hospital, Te Whatu Ora - Waitaha, New Zealand. May 2026

For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?

Web links for this sheet in different formats

Click on buttons to copy web addresses for this leaflet:

If your browser does not automatically copy these links use its copy command instead.

About My Medicines

My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.

For more information about the sheets, see: What does a My Medicines sheet cover?

My Medicines is developed by a team at Te Whatu Ora – Waitaha. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed