How long is emergency contraceptive effective for?

Within 72 hours of ovulation . Within 72 hours of menstruation. Within 72 hours of implantation. Within 72 hours of coitus.

Within 72 hours of coitus.

Administration of progestogens or progestogen-estrogen combinations or IUDs within 72 hours of coitus have been found to be very effective as emergency contraceptives as they could be used to avoid possible pregnancy due to rape or casual unprotected intercourse.