Heart Lexicon

What is the difference?

Emergency contraceptive pill vs Copper IUD

There are two kinds of emergency contraception: a pill and the copper IUD. Many people only know about the pill, yet the copper IUD is the more effective option and can also stay in as ongoing contraception.

General information, not medical advice. For advice about your own situation, talk to a clinician, pharmacist or sexual health clinic.

Emergency contraceptive pill

The emergency contraceptive pill is a single-dose tablet taken after unprotected sex that mainly works by delaying ovulation.

Full entry

Copper IUD

A copper IUD is a small T-shaped device with copper that is placed in the uterus and prevents pregnancy without hormones for five to ten years.

Full entry

Side by side

Emergency contraceptive pillCopper IUD
Time limit after sexEmergency contraceptive pillWithin 3 days for levonorgestrel, within 5 days for ulipristal acetate.Copper IUDWithin 5 days.
EffectivenessEmergency contraceptive pillWorks well, best the sooner it is taken; less effective if ovulation has already happened.Copper IUDThe most effective emergency contraception available.
Getting itEmergency contraceptive pillFrom pharmacies, often without a prescription, as well as clinics.Copper IUDFitted by a trained clinician at a sexual health clinic or some GP surgeries.
Affected by body weight or medicinesEmergency contraceptive pillA higher body weight or some medicines may make it less effective.Copper IUDNot affected.
AfterwardsEmergency contraceptive pillProtects only against that episode; regular contraception is still needed.Copper IUDCan stay in as contraception for 5 to 10 years.

In short

The pill is quicker to get; the copper IUD is more effective and doubles as long-term contraception. A pharmacist or clinic can help choose quickly.

What they have in common

Both are used after unprotected sex or a contraceptive failure, neither is an abortion, neither protects against STIs, and both are available free from many sexual health services.

Sources

  1. NHSEmergency contraception
  2. Planned ParenthoodEmergency contraception

More comparisons

Last reviewed 16 October 2026. Spotted a mistake?