Emergency contraceptives are effective if used within:
a. 72 hrs of coitus
b. 72 hrs of ovulation
c. 72 hrs of menstruation
d. 72 hrs of implantation
The answer is the option (a) 72 hours of Coitus
Explanation: The use of emergency contraceptives such as progesterone or a progesterone-estrogen combination within three days following sexual intercourse demonstrates significant effectiveness in preventing pregnancy. To mitigate the risk of pregnancy, emergency contraception should be taken within 72 hours after intercourse, as the likelihood of fertilization and implantation rises after this time frame.