Does I pill work after 72 hours

How does it work?

It prevents or delays the release of an egg from the ovary (ovulation). It may also affect the lining of the womb so a fertilised egg can’t settle.

How effective is it?

The sooner Levonelle is taken after unprotected sex, the more likely it will work. If taken within 24 hours of unprotected sex, Levonelle will prevent up to 95% of pregnancies expected to have occurred if emergency contraception had not been used. If taken between 25 to 48 hours after sex, it will prevent up to 85% of pregnancies and between 49 to 72 hours after sex, it will prevent up to 58% of pregnancies that would have been expected to occur.

ellaOne is believed to be more effective than Levonelle and works as well regardless of when it is taken after unprotected sex (up to 120 hours).

Can it fail?


When is it more likely to fail?
  • Levonelle is more likely to fail the longer you wait to take it after unprotected sex.
  • If you vomit within two hours of taking the pill. Speak to a doctor, nurse or pharmacist if this happens.
  • If you’ve had unprotected sex at any other time since your last period or since taking the emergency contraceptive pill.
Does the emergency contraceptive pill give me ongoing protection against pregnancy?

No. If you've had unprotected sex again, you may need emergency contraception again - seek some advice. Emergency contraception isn't reliable as a regular method of contraception.

Are there any side effects?

Yes, there can be side effects, such as:

  • nausea and vomiting
  • dizziness or tiredness
  • headaches
  • breast tenderness.
Can anyone use the emergency contraceptive pill?

Most women can, even those who cannot use the combined contraceptive pills or contraceptive patch. Breastfeeding women can use the emergency contraceptive pill.

Certain medicines (both prescribed and complementary) can affect the emergency contraceptive pill and in this case, you should seek advice.

What else should I know about the emergency contraceptive pill?
  • Your next period may arrive at the expected time or be a little early or late; for some women, their next period can be late by a week or more.
  • You may get some spotting or heavier bleeding up to the time your period arrives.
  • If the emergency contraceptive pill fails to prevent pregnancy, there is no evidence that the fetus will be damaged by the pill.
  • Emergency contraception is not intended to be used regularly but should be used as a back-up to other methods of contraception.
  • The emergency contraceptive pill poses little risk to women’s health.
  • There is no limit to how many times you can use Levonelle. It is recommended that ellaOne is taken only once during a cycle.
  • There is no age limit for smokers.
How will I know if it has worked?

If your next period seems like a normal period, it is unlikely that you are pregnant. However, you should do a pregnancy test if:

  • you feel pregnant
  • your period has not arrived within 3 weeks of taking the emergency contraceptive pill
  • you do not have a bleed at the expected time, if you are taking hormonal contraception (like the pill).

If you do a pregnancy test from 3 weeks after the last time you had unprotected sex, the test should be reliable.

Where can I get the emergency contraceptive pill?

From pharmacies, your GP, family planning clinics, NHS walk-in centres, some hospital accident and emergency departments and BPAS.