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
According to the NCERT text, 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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