A postcoital contraceptive pill that can be used in emergency situations for preventing pregnancy after unprotected intercourse has occurred. It must be taken within 72 hours and again 12 hours after the initial dose.

Synonym for emergency contraception.

a large dose of estrogen taken orally within 24 to 72 hours after intercourse; prevents implantation of a fertilized ovum and so acts as a contraceptive; commonly used after rape or incest