Emergency contraceptive methods must be employed within:
72 hours of ovulation
72 hours of onset of menstrual flow
72 hours of unprotected coitus
72 hours of cessation of menstrual flow
administration of progestogens or progestogen-estrogen combinations or IUDs within 72 hours of coitus have been found to be very effective as emergency contraceptives to avoid possible pregnancy due to rape or casual unprotected intercourse .
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