How should 24h, 36h, 48h contraceptive pills be taken?

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Hello pharmacist,
I have learned about 24h, 36h contraceptive pills. 48h. So the pharmacist told me how to take the 24h, 36h, and 48h contraceptive pills? Thank you pharmacist.
Nguyen Dong Thi (2005)
Answer
Answered by Pharmacist Nguyen Thu Giang - Faculty of Pharmacy, Vinmec Times City International General Hospital.
Hello,
With the question “How should 24h, 36h, 48h contraceptive pills be taken? , pharmacist would like to answer as follows:
24h, 36h, 48h pills mean effective within 24h, 36h, 48h after sex. According to the manufacturer's instructions, drink after sex. If you take it before sex, you need to take it as close as possible because the drug has a certain duration of action and decreases over time. If you take it before but too far from the time of intercourse, the effectiveness of the drug will also be reduced.
If you still have questions about the 24-hour contraceptive pill, you can go to a hospital of Vinmec Health System for further examination and advice. Thank you for trusting and sending questions to Vinmec. Wishing you lots of health.
Best regards!